556 lines
20 KiB
Text
556 lines
20 KiB
Text
/*
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This is a collection of rules that use external variables
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They work with scanners that support the use of external variables, like
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THOR, LOKI or SPARK
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https://www.nextron-systems.com/compare-our-scanners/
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*/
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import "pe"
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import "math"
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rule Acrotray_Anomaly {
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meta:
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description = "Detects an acrotray.exe that does not contain the usual strings"
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license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
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author = "Florian Roth (Nextron Systems)"
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score = 75
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id = "e3fef644-e535-5137-ac98-2fd1b7ca4361"
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strings:
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$s1 = "PDF/X-3:2002" fullword wide
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$s2 = "AcroTray - Adobe Acrobat Distiller helper application" fullword wide
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$s3 = "MS Sans Serif" fullword wide
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$s4 = "COOLTYPE.DLL" fullword ascii
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condition:
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uint16(0) == 0x5a4d and filesize < 3000KB
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and ( filename == "acrotray.exe" or filename == "AcroTray.exe" )
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and not all of ($s*)
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}
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rule COZY_FANCY_BEAR_modified_VmUpgradeHelper {
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meta:
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description = "Detects a malicious VmUpgradeHelper.exe as mentioned in the CrowdStrike report"
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license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
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author = "Florian Roth (Nextron Systems)"
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reference = "https://www.crowdstrike.com/blog/bears-midst-intrusion-democratic-national-committee/"
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date = "2016-06-14"
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id = "97b844a4-0fa4-5850-8803-2212a69e3d16"
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strings:
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$s1 = "VMware, Inc." wide fullword
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$s2 = "Virtual hardware upgrade helper service" fullword wide
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$s3 = "vmUpgradeHelper\\vmUpgradeHelper.pdb" ascii
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condition:
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uint16(0) == 0x5a4d and
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filename == "VmUpgradeHelper.exe" and
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not all of ($s*)
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}
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rule IronTiger_Gh0stRAT_variant
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{
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meta:
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author = "Cyber Safety Solutions, Trend Micro"
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description = "This is a detection for a s.exe variant seen in Op. Iron Tiger"
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reference = "http://goo.gl/T5fSJC"
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id = "e7eeee0f-d7a1-5359-bc1f-5a2a883c7227"
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strings:
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$str1 = "Game Over Good Luck By Wind" nocase wide ascii
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$str2 = "ReleiceName" nocase wide ascii
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$str3 = "jingtisanmenxiachuanxiao.vbs" nocase wide ascii
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$str4 = "Winds Update" nocase wide ascii fullword
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condition:
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uint16(0) == 0x5a4d and (any of ($str*))
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and not filename == "UpdateSystemMib.exe"
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}
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rule OpCloudHopper_Cloaked_PSCP {
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meta:
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description = "Tool used in Operation Cloud Hopper - pscp.exe cloaked as rundll32.exe"
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license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
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author = "Florian Roth (Nextron Systems)"
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reference = "https://www.pwc.co.uk/cyber-security/pdf/cloud-hopper-annex-b-final.pdf"
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date = "2017-04-07"
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score = 90
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id = "c1e2e456-dbdd-54cf-b0e0-b356f291cfcd"
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strings:
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$s1 = "AES-256 SDCTR" ascii
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$s2 = "direct-tcpip" ascii
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condition:
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all of them and filename == "rundll32.exe"
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}
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rule msi_dll_Anomaly {
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meta:
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description = "Detetcs very small and supicious msi.dll"
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license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
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author = "Florian Roth (Nextron Systems)"
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reference = "https://blog.cylance.com/shell-crew-variants-continue-to-fly-under-big-avs-radar"
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date = "2017-02-10"
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hash1 = "8c9048e2f5ea2ef9516cac06dc0fba8a7e97754468c0d9dc1e5f7bce6dbda2cc"
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id = "92cd5c51-ed84-5428-9105-50139f9289c8"
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strings:
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$x1 = "msi.dll.eng" fullword wide
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condition:
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uint16(0) == 0x5a4d and filesize < 15KB and filename == "msi.dll" and $x1
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}
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rule PoS_Malware_MalumPOS_Config
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{
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meta:
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license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
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author = "Florian Roth (Nextron Systems)"
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date = "2015-06-25"
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description = "MalumPOS Config File"
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reference = "http://blog.trendmicro.com/trendlabs-security-intelligence/trend-micro-discovers-malumpos-targets-hotels-and-other-us-industries/"
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id = "0fd2b9c2-d016-5db2-8fcc-618df6c815de"
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strings:
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$s1 = "[PARAMS]"
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$s2 = "Name="
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$s3 = "InterfacesIP="
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$s4 = "Port="
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condition:
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all of ($s*) and filename == "log.ini" and filesize < 20KB
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}
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rule Malware_QA_update_test {
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meta:
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description = "VT Research QA uploaded malware - file update_.exe"
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license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
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author = "Florian Roth (Nextron Systems)"
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reference = "VT Research QA"
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date = "2016-08-29"
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score = 80
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hash1 = "3b3392bc730ded1f97c51e23611740ff8b218abf0a1100903de07819eeb449aa"
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id = "8f319277-1eaf-559e-87ad-f4ab89b04ca5"
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strings:
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$s1 = "test.exe" fullword ascii
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$s2 = "PADDINGXXPADDINGPADDINGXXPADDINGPADDINGXXPADDINGPADDINGXXPADDINGP" fullword ascii
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condition:
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uint16(0) == 0x5a4d and filesize < 1000KB and all of them and filename == "update.exe"
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}
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/* These only work with external variable "filename" ------------------------ */
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/* as used in LOKI, THOR, SPARK --------------------------------------------- */
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rule SysInterals_PipeList_NameChanged {
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meta:
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description = "Detects NirSoft PipeList"
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license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
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author = "Florian Roth (Nextron Systems)"
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reference = "https://goo.gl/Mr6M2J"
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date = "2016-06-04"
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score = 90
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hash1 = "83f0352c14fa62ae159ab532d85a2b481900fed50d32cc757aa3f4ccf6a13bee"
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id = "01afcf29-a74c-5be2-8b24-694a2802ef34"
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strings:
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$s1 = "PipeList" ascii fullword
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$s2 = "Sysinternals License" ascii fullword
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condition:
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uint16(0) == 0x5a4d and filesize < 170KB and all of them
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and not filename contains "pipelist.exe"
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and not filename contains "PipeList.exe"
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}
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/*
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Yara Rule Set
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Author: Florian Roth
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Date: 2016-04-26
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Identifier: regsvr32 issue
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*/
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/* Rule Set ----------------------------------------------------------------- */
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rule SCT_Scriptlet_in_Temp_Inet_Files {
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meta:
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description = "Detects a scriptlet file in the temporary Internet files (see regsvr32 AppLocker bypass)"
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license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
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author = "Florian Roth (Nextron Systems)"
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reference = "http://goo.gl/KAB8Jw"
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date = "2016-04-26"
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id = "8b729257-3676-59b2-961c-dae1085cbbf6"
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strings:
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$s1 = "<scriptlet>" fullword ascii nocase
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$s2 = "ActiveXObject(\"WScript.Shell\")" ascii
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condition:
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( uint32(0) == 0x4D583F3C or uint32(0) == 0x6D78F3C ) /* <?XM or <?xm */
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and $s1 and $s2
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and filepath contains "Temporary Internet Files"
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}
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rule GIFCloaked_Webshell_A {
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meta:
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description = "Looks like a webshell cloaked as GIF"
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license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
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author = "Florian Roth (Nextron Systems)"
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hash = "f1c95b13a71ca3629a0bb79601fcacf57cdfcf768806a71b26f2448f8c1d5d24"
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score = 60
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id = "4fdef65c-204a-5019-9b4f-c5877c3e39d4"
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strings:
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$s0 = "input type"
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$s1 = "<%eval request"
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$s2 = "<%eval(Request.Item["
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$s3 = "LANGUAGE='VBScript'"
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$s4 = "$_REQUEST" fullword
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$s5 = ";eval("
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$s6 = "base64_decode"
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$fp1 = "<form name=\"social_form\""
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condition:
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uint32(0) == 0x38464947 and ( 1 of ($s*) )
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and not 1 of ($fp*)
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}
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/* causes FPs and relevancy is limited
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rule exploit_ole_stdolelink {
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meta:
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author = "David Cannings"
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description = "StdOleLink, potential 0day in April 2017"
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score = 55
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strings:
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// Parsers will open files without the full 'rtf'
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$header_rtf = "{\\rt" nocase
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$header_office = { D0 CF 11 E0 }
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$header_xml = "<?xml version=" nocase wide ascii
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// Marks of embedded data (reduce FPs)
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// RTF format
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$embedded_object = "\\object" nocase
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$embedded_objdata = "\\objdata" nocase
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$embedded_ocx = "\\objocx" nocase
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$embedded_objclass = "\\objclass" nocase
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$embedded_oleclass = "\\oleclsid" nocase
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// XML Office documents
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$embedded_axocx = "<ax:ocx" nocase wide ascii
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$embedded_axclassid = "ax:classid" nocase wide ascii
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// OLE format
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$embedded_root_entry = "Root Entry" wide
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$embedded_comp_obj = "Comp Obj" wide
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$embedded_obj_info = "Obj Info" wide
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$embedded_ole10 = "Ole10Native" wide
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$data0 = "00000300-0000-0000-C000-000000000046" nocase wide ascii
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$data2 = "OLE2Link" nocase wide ascii
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$data3 = "4f4c45324c696e6b" nocase wide ascii
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$data4 = "StdOleLink" nocase wide ascii
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$data5 = "5374644f6c654c696e6b" nocase wide ascii
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condition:
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// Mandatory header plus sign of embedding, then any of the others
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for any of ($header*) : ( @ == 0 ) and 1 of ($embedded*)
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and (1 of ($data*))
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and extension != ".msi"
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}
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*/
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rule HackTool_Producers {
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meta:
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description = "Hacktool Producers String"
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threat_level = 5
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score = 50
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nodeepdive = 1
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id = "75cb2c86-0eaa-5cf5-96d8-85b91054de36"
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strings:
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$a1 = "www.oxid.it"
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$a2 = "www.analogx.com"
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$a3 = "ntsecurity.nu"
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$a4 = "gentilkiwi.com"
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$a6 = "Marcus Murray"
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$a7 = "Nsasoft US LLC0"
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$a8 = " Nir Sofer"
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condition:
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uint16(0) == 0x5a4d and 1 of ($a*) and
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not extension contains ".ini" and
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not extension contains ".xml" and
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not extension contains ".sqlite"
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}
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rule Exe_Cloaked_as_ThumbsDb
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{
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meta:
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description = "Detects an executable cloaked as thumbs.db - Malware"
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date = "2014-07-18"
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license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
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author = "Florian Roth (Nextron Systems)"
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score = 50
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id = "ff09f8cf-de5a-50fc-aa0b-c54f7667e246"
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condition:
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uint16(0) == 0x5a4d and filename matches /[Tt]humbs\.db/
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}
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rule Fake_AdobeReader_EXE
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{
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meta:
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description = "Detects an fake AdobeReader executable based on filesize OR missing strings in file"
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date = "2014-09-11"
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author = "Florian Roth (Nextron Systems)"
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score = 50
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nodeepdive = 1
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nodeepdive = 1
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id = "e3dd9d94-9f4b-5ff9-bfec-29abfb3555bb"
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strings:
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$s1 = "Adobe Systems" ascii
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$fp1 = "Adobe Reader" ascii wide
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$fp2 = "Xenocode Virtual Appliance Runtime" ascii wide
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condition:
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uint16(0) == 0x5a4d and
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filename matches /AcroRd32.exe/i and
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not $s1 in (filesize-2500..filesize)
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and not 1 of ($fp*)
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}
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rule mimikatz_lsass_mdmp
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{
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meta:
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description = "LSASS minidump file for mimikatz"
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author = "Benjamin DELPY (gentilkiwi)"
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id = "3d850dbe-1342-55ac-b0f7-91343d88f147"
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strings:
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$lsass = "System32\\lsass.exe" wide nocase
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condition:
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(uint32(0) == 0x504d444d) and $lsass and filesize > 50000KB and not filename matches /WER/
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}
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rule lsadump {
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meta:
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description = "LSA dump programe (bootkey/syskey) - pwdump and others"
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author = "Benjamin DELPY (gentilkiwi)"
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score = 80
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nodeepdive = 1
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id = "3bfa8dd8-720d-5326-ac92-0fb96cf21219"
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strings:
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$str_sam_inc = "\\Domains\\Account" ascii nocase
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$str_sam_exc = "\\Domains\\Account\\Users\\Names\\" ascii nocase
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$hex_api_call = {(41 b8 | 68) 00 00 00 02 [0-64] (68 | ba) ff 07 0f 00 }
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$str_msv_lsa = { 4c 53 41 53 52 56 2e 44 4c 4c 00 [0-32] 6d 73 76 31 5f 30 2e 64 6c 6c 00 }
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$hex_bkey = { 4b 53 53 4d [20-70] 05 00 01 00}
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$fp1 = "Sysinternals" ascii
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$fp2 = "Apple Inc." ascii wide
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$fp3 = "Kaspersky Lab" ascii fullword
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$fp4 = "ESET Security" ascii
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$fp5 = "Disaster Recovery Module" wide
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$fp6 = "Bitdefender" wide fullword
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condition:
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uint16(0) == 0x5a4d and
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(($str_sam_inc and not $str_sam_exc) or $hex_api_call or $str_msv_lsa or $hex_bkey )
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and not 1 of ($fp*)
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and not filename contains "Regdat"
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and not filetype == "EXE"
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and not filepath contains "Dr Watson"
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and not extension == "vbs"
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}
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rule SUSP_ServU_SSH_Error_Pattern_Jul21_1 {
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meta:
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description = "Detects suspicious SSH component exceptions that could be an indicator of exploitation attempts as described in advisory addressing CVE-2021-35211 in ServU services"
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author = "Florian Roth (Nextron Systems)"
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reference = "https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35211#FAQ"
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date = "2021-07-12"
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score = 60
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id = "1a89f0b0-445c-5867-94cd-f07ba1becad6"
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strings:
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$s1 = "EXCEPTION: C0000005;" ascii
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$s2 = "CSUSSHSocket::ProcessReceive();" ascii
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condition:
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filename == "DebugSocketlog.txt"
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and all of ($s*)
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}
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rule SUSP_ServU_Known_Mal_IP_Jul21_1 {
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meta:
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description = "Detects suspicious IP addresses used in exploitation of ServU services CVE-2021-35211 and reported by Solarwinds"
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author = "Florian Roth (Nextron Systems)"
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reference = "https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35211#FAQ"
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date = "2021-07-12"
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score = 60
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id = "118272a7-7ec9-568b-99e0-8cfe97f3f64e"
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strings:
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$xip1 = "98.176.196.89" ascii fullword
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$xip2 = "68.235.178.32" ascii fullword
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$xip3 = "208.113.35.58" ascii fullword
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$xip4 = "144.34.179.162" ascii fullword
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$xip5 = "97.77.97.58" ascii fullword
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condition:
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filename == "DebugSocketlog.txt"
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and 1 of them
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}
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rule SUSP_EXPL_Confluence_RCE_CVE_2021_26084_Indicators_Sep21 {
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meta:
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description = "Detects ELF binaries owner by the confluence user but outside usual confluence directories"
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author = "Florian Roth (Nextron Systems)"
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reference = "https://attackerkb.com/topics/Eu74wdMbEL/cve-2021-26084-confluence-server-ognl-injection/rapid7-analysis"
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date = "2021-09-01"
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score = 55
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id = "395d37ea-1986-5fdd-b58c-562ae0d8be35"
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condition:
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uint32be(0) == 0x7f454c46 /* ELF binary */
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and owner == "confluence"
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and not filepath contains "/confluence/"
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}
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rule SUSP_Blocked_Download_Proxy_Replacement_Jan23_1 {
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meta:
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description = "Detects a file that has been replaced with a note by a security solution like an Antivirus or a filtering proxy server"
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author = "Florian Roth (Nextron Systems)"
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reference = "https://www.virustotal.com/gui/search/filename%253A*.exe%2520tag%253Ahtml%2520size%253A10kb-%2520size%253A2kb%252B/files"
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date = "2023-01-28"
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score = 60
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id = "58bc8288-6bdb-57d5-9de5-a54a39584838"
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strings:
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$x01 = "Web Filter Violation"
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$x02 = "Google Drive can't scan this file for viruses."
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$x03 = " target=\"_blank\">Cloudflare <img "
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$x04 = "Sorry, this file is infected with a virus.</p>"
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$x05 = "-- Sophos Warn FileType Page -->"
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$x06 = "<p>Certain Sophos products may not be exported for use by government end-users" // accept EULA
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$x07 = "<p class=\"content-list\">Bitly displays this warning when a link has been flagged as suspect. There are many"
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$x08 = "Something went wrong. Don't worry, your files are still safe and the Dropbox team has been notified."
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$x09 = "<p>sinkhole</p>"
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$x10 = "The requested short link is blocked by website administration due to violation of the website policy terms."
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$x11 = "<img src=\"https://www.malwarebytes.com/images/"
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$x12 = "<title>Malwarebytes</title>"
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$x13 = "<title>Blocked by VIPRE</title>"
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$x14 = "<title>Your request appears to be from an automated process</title>"
|
|
$x15 = "<p>Advanced Security blocked access to"
|
|
$x16 = "<title>Suspected phishing site | Cloudflare</title>"
|
|
$x17 = ">This link has been flagged "
|
|
$x18 = "<h1>Trend Micro Apex One</h1>"
|
|
$x19 = "Hitachi ID Identity and Access Management Suite"
|
|
$x20 = ">http://www.fortinet.com/ve?vn="
|
|
$x21 = "access to URL with fixed IP not allowed" // FritzBox
|
|
$x23 = "<title>Web Page Blocked</title>"
|
|
$x24 = "<title>Malicious Website Blocked</title>"
|
|
$x25 = "<h2>STOPzilla has detected"
|
|
$x26 = ">Seqrite Endpoint Security</span>"
|
|
$x27 = "<TITLE>K7 Safe Surf</TITLE>"
|
|
$x28 = "<title>Blocked by VIPRE</title>"
|
|
|
|
$g01 = "blocked access" fullword
|
|
$g02 = "policy violation" fullword
|
|
$g03 = "violation of "
|
|
$g04 = "blocked by" fullword
|
|
$g05 = "Blocked by" fullword
|
|
$g07 = "Suspected Phishing"
|
|
$g08 = "ile quarantined"
|
|
$g09 = " is infected "
|
|
$g10 = "Blocked</title>"
|
|
$g11 = "site blocked" fullword
|
|
$g12 = "Site Blocked" fullword
|
|
$g13 = "blocked for" fullword
|
|
$g14 = "is blocked" fullword
|
|
$g15 = "potentially harmful"
|
|
$g16 = "Page Blocked" fullword
|
|
$g17 = "page blocked" fullword
|
|
condition:
|
|
extension == ".exe" and not uint16(0) == 0x5a4d and 1 of them
|
|
or (
|
|
extension == ".rar" or
|
|
extension == ".ps1" or
|
|
extension == ".vbs" or
|
|
extension == ".bat"
|
|
)
|
|
and 1 of ($x*)
|
|
}
|
|
|
|
/* too many FPs
|
|
rule APT_MAL_RU_WIN_Snake_Malware_PeIconSizes_May23_1 {
|
|
meta:
|
|
description = "Detects Comadmin file that houses Snake's kernel driver and the driver's loader"
|
|
author = "CSA"
|
|
reference = "https://media.defense.gov/2023/May/09/2003218554/-1/-1/0/JOINT_CSA_HUNTING_RU_INTEL_SNAKE_MALWARE_20230509.PDF"
|
|
date = "2023-05-10"
|
|
score = 75
|
|
condition:
|
|
uint16(0) == 0x5a4d
|
|
and (
|
|
filename == "WerFault.exe"
|
|
or filename == "werfault.exe"
|
|
)
|
|
and filepath contains "\\WinSxS\\"
|
|
and for any rsrc in pe.resources: (
|
|
rsrc.type == pe.RESOURCE_TYPE_ICON and rsrc.length == 3240
|
|
)
|
|
and for any rsrc in pe.resources: (
|
|
rsrc.type == pe.RESOURCE_TYPE_ICON and rsrc.length == 1384
|
|
)
|
|
and for any rsrc in pe.resources: (
|
|
rsrc.type == pe.RESOURCE_TYPE_ICON and rsrc.length == 7336
|
|
)
|
|
}
|
|
*/
|
|
|
|
rule APT_MAL_RU_Snake_Malware_Queue_File_May23_1 {
|
|
meta:
|
|
description = "Detects Queue files used by Snake malware"
|
|
author = "Florian Roth"
|
|
reference = "https://media.defense.gov/2023/May/09/2003218554/-1/-1/0/JOINT_CSA_HUNTING_RU_INTEL_SNAKE_MALWARE_20230509.PDF"
|
|
date = "2023-05-10"
|
|
score = 80
|
|
id = "c7ed554e-b55e-5c3f-aa8b-231cb1073f34"
|
|
condition:
|
|
filename matches /(\{[0-9A-Fa-f]{8}\-([0-9A-Fa-f]{4}\-){3}[0-9A-Fa-f]{12}\}\.){2}crmlog/
|
|
/* and filepath contains "\\Registration\\" // not needed - already specific enough */
|
|
// we reduce the range for the entropy calculation to the first 1024 for performance
|
|
// reasons. In a fully encrypted file - as used by Snake - this should already be specific enough
|
|
//and math.entropy(0, filesize) >= 7.0
|
|
and math.entropy(0, 1024) >= 7.0
|
|
}
|
|
|
|
|
|
rule SUSP_Password_XLS_Unencrypted {
|
|
meta:
|
|
description = "Detects files named e.g. password.xls, which might contain unportected clear text passwords"
|
|
author = "Arnim Rupp (https://github.com/ruppde)"
|
|
reference = "Internal Research"
|
|
date = "2023-10-04"
|
|
score = 60
|
|
id = "41096ef1-dd02-5956-9053-3d7fb1a5092c"
|
|
condition:
|
|
// match password and the german passwort:
|
|
(
|
|
filename istartswith "passwor" or /* EN / DE */
|
|
filename istartswith "contrase" or /* ES */
|
|
filename istartswith "mot de pass" or /* FR */
|
|
filename istartswith "mot_de_pass" or /* FR */
|
|
filename istartswith "motdepass" or /* FR */
|
|
filename istartswith "wachtwoord" /* NL */
|
|
)
|
|
and (
|
|
// no need to check if an xls is password protected, because it's trivial to break
|
|
(
|
|
filename iendswith ".xls"
|
|
and uint32be(0) == 0xd0cf11e0 // xls
|
|
)
|
|
or
|
|
(
|
|
filename iendswith ".xlsx"
|
|
and uint32be(0) == 0x504b0304 // unencrypted xlsx = pkzip
|
|
)
|
|
)
|
|
}
|
|
|
|
rule SUSP_Password_XLS_Encrypted {
|
|
meta:
|
|
description = "Detects files named e.g. password.xlsx, which might contain clear text passwords, but are password protected from MS Office"
|
|
author = "Arnim Rupp (https://github.com/ruppde)"
|
|
reference = "Internal Research"
|
|
date = "2023-10-04"
|
|
score = 50
|
|
id = "d3334923-3396-524d-9111-8ccb754ab99e"
|
|
condition:
|
|
// match password and the german passwort:
|
|
(
|
|
filename istartswith "passwor" or /* EN / DE */
|
|
filename istartswith "contrase" or /* ES */
|
|
filename istartswith "mot de pass" or /* FR */
|
|
filename istartswith "mot_de_pass" or /* FR */
|
|
filename istartswith "motdepass" or /* FR */
|
|
filename istartswith "wachtwoord" /* NL */
|
|
)
|
|
and filename iendswith ".xlsx"
|
|
and uint32be(0) == 0xd0cf11e0 // encrypted xlsx = CDFV2
|
|
}
|