233 lines
9.6 KiB
Text
233 lines
9.6 KiB
Text
/*
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https://thedfirreport.com/2021/08/29/cobalt-strike-a-defenders-guide/
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*/
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import "pe"
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rule CS_default_exe_beacon_stager {
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meta:
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description = "Remote CS beacon execution as a service - spoolsv.exe"
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author = "TheDFIRReport"
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date = "2021-07-13"
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hash1 = "f3dfe25f02838a45eba8a683807f7d5790ccc32186d470a5959096d009cc78a2"
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strings:
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$s1 = "windir" fullword ascii
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$s2 = "rundll32.exe" fullword ascii
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$s3 = "VirtualQuery failed for %d bytes at address %p" fullword ascii
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$s4 = "msvcrt.dll" fullword wide
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condition:
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uint16(0) == 0x5a4d and filesize < 800KB and (pe.imphash() == "93f7b1a7b8b61bde6ac74d26f1f52e8d" and
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3 of them ) or ( all of them )
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}
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rule tdr615_exe {
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meta:
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description = "Cobalt Strike on beachhead: tdr615.exe"
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author = "TheDFIRReport"
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reference = "https://thedfirreport.com/2021/08/01/bazarcall-to-conti-ransomware-via-trickbot-and-cobalt-strike/"
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date = "2021-07-07"
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hash1 = "12761d7a186ff14dc55dd4f59c4e3582423928f74d8741e7ec9f761f44f369e5"
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strings:
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$a1 = "AppPolicyGetProcessTerminationMethod" fullword ascii
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$a2 = "I:\\RoDcnyLYN\\k1GP\\ap0pivKfOF\\odudwtm30XMz\\UnWdqN\\01\\7aXg1kTkp.pdb" fullword ascii
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$b1 = "ealagi@aol.com0" fullword ascii
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$b2 = "operator co_await" fullword ascii
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$b3 = "GetModuleHandleRNtUnmapViewOfSe" fullword ascii
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$b4 = "RtlExitUserThrebNtFlushInstruct" fullword ascii
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$c1 = "Jersey City1" fullword ascii
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$c2 = "Mariborska cesta 971" fullword ascii
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condition:
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uint16(0) == 0x5a4d and filesize < 10000KB and
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any of ($a* ) and 2 of ($b* ) and any of ($c* )
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}
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import "pe"
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rule CS_DLL {
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meta:
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description = "62.dll"
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author = "TheDFIRReport"
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reference = "https://thedfirreport.com/2021/08/01/bazarcall-to-conti-ransomware-via-trickbot-and-cobalt-strike/"
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date = "2021-07-07"
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hash1 = "8b9d605b826258e07e63687d1cefb078008e1a9c48c34bc131d7781b142c84ab"
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strings:
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$s1 = "Common causes completion include incomplete download and damaged media" fullword ascii
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$s2 = "StartW" fullword ascii
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$s4 = ".rdata$zzzdbg" fullword ascii
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condition:
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uint16(0) == 0x5a4d and filesize < 70KB and ( pe.imphash() == "42205b145650671fa4469a6321ccf8bf" )
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or (all of them)
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}
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rule conti_cobaltstrike_192145_icju1_0 {
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meta:
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description = "files - from files 192145.dll, icju1.exe"
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author = "The DFIR Report"
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reference = "https://thedfirreport.com"
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date = "2021-05-09"
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hash1 = "29bc338e63a62c24c301c04961084013816733dad446a29c20d4413c5c818af9"
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hash2 = "e54f38d06a4f11e1b92bb7454e70c949d3e1a4db83894db1ab76e9d64146ee06"
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strings:
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$x1 = "cmd.exe /c echo NGAtoDgLpvgJwPLEPFdj>\"%s\"&exit" fullword ascii
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$s2 = "veniamatquiest90.dll" fullword ascii
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$s3 = "Quaerat magni assumenda nihil architecto labore ullam autem unde temporibus mollitia illum" fullword ascii
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$s4 = "Quaerat tempora culpa provident" fullword ascii
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$s5 = "Dolores ullam tempora error distinctio ut natus facere quibusdam" fullword ascii
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$s6 = "Velit consequuntur quisquam tempora error" fullword ascii
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$s7 = "Corporis minima omnis qui est temporibus sint quo error magnam" fullword ascii
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$s8 = "Quo omnis repellat ut expedita temporibus eius fuga error" fullword ascii
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$s9 = "Officia sit maiores deserunt nobis tempora deleniti aut et quidem fugit" fullword ascii
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$s10 = "Rerum tenetur sapiente est tempora qui deserunt" fullword ascii
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$s11 = "Sed nulla quaerat porro error excepturi" fullword ascii
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$s12 = "Aut tempore quo cumque dicta ut quia in" fullword ascii
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$s13 = "Doloribus commodi repudiandae voluptates consequuntur neque tempora ut neque nemo ad ut" fullword ascii
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$s14 = "Tempore possimus aperiam nam mollitia illum hic at ut doloremque" fullword ascii
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$s15 = "Et quia aut temporibus enim repellat dolores totam recusandae repudiandae" fullword ascii
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$s16 = "Dolorum eum ipsum tempora non et" fullword ascii
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$s17 = "Quas alias illum laborum tempora sit est rerum temporibus dicta et" fullword ascii
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$s18 = "Sed velit ipsa et dolor tempore sunt nostrum" fullword ascii
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$s19 = "Veniam voluptatem aliquam et eaque tempore tenetur possimus" fullword ascii
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$s20 = "Possimus suscipit placeat dolor quia tempora voluptas qui fugiat et accusantium" fullword ascii
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condition:
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( uint16(0) == 0x5a4d and filesize < 2000KB and ( 1 of ($x*) and 4 of them )
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) or ( all of them )
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}
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rule cobalt_strike_tmp01925d3f {
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meta:
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description = "files - file ~tmp01925d3f.exe"
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author = "The DFIR Report"
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reference = "https://thedfirreport.com"
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date = "2021-02-22"
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hash1 = "10ff83629d727df428af1f57c524e1eaddeefd608c5a317a5bfc13e2df87fb63"
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strings:
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$x1 = "C:\\Users\\hillary\\source\\repos\\gromyko\\Release\\gromyko.pdb" fullword ascii
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$x2 = "api-ms-win-core-synch-l1-2-0.dll" fullword wide /* reversed goodware string 'lld.0-2-1l-hcnys-eroc-niw-sm-ipa' */
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$s3 = "gromyko32.dll" fullword ascii
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$s4 = "<requestedExecutionLevel level='asInvoker' uiAccess='false'/>" fullword ascii
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$s5 = "AppPolicyGetProcessTerminationMethod" fullword ascii
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$s6 = "https://sectigo.com/CPS0" fullword ascii
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$s7 = "2http://crl.comodoca.com/AAACertificateServices.crl04" fullword ascii
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$s8 = "?http://crl.usertrust.com/USERTrustRSACertificationAuthority.crl0v" fullword ascii
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$s9 = "3http://crt.usertrust.com/USERTrustRSAAddTrustCA.crt0%" fullword ascii
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$s10 = "http://ocsp.sectigo.com0" fullword ascii
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$s11 = "2http://crl.sectigo.com/SectigoRSACodeSigningCA.crl0s" fullword ascii
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$s12 = "2http://crt.sectigo.com/SectigoRSACodeSigningCA.crt0#" fullword ascii
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$s13 = "http://www.digicert.com/CPS0" fullword ascii
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$s14 = "AppPolicyGetThreadInitializationType" fullword ascii
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$s15 = "alerajner@aol.com0" fullword ascii
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$s16 = "gromyko.inf" fullword ascii
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$s17 = "operator<=>" fullword ascii
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$s18 = "operator co_await" fullword ascii
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$s19 = "gromyko" fullword ascii
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$s20 = "api-ms-win-appmodel-runtime-l1-1-2" fullword wide
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condition:
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uint16(0) == 0x5a4d and filesize < 1000KB and
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( pe.imphash() == "1b1b73382580c4be6fa24e8297e1849d" or ( 1 of ($x*) or 4 of them ) )
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}
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rule cobalt_strike_TSE28DF {
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meta:
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description = "exe - file TSE28DF.exe"
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author = "The DFIR Report"
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reference = "https://thedfirreport.com"
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date = "2021-01-05"
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hash1 = "65282e01d57bbc75f24629be9de126f2033957bd8fe2f16ca2a12d9b30220b47"
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strings:
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$s1 = "mneploho86.dll" fullword ascii
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$s2 = "C:\\projects\\Project1\\Project1.pdb" fullword ascii
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$s3 = "AppPolicyGetProcessTerminationMethod" fullword ascii
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$s4 = "AppPolicyGetThreadInitializationType" fullword ascii
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$s5 = "boltostrashno.nfo" fullword ascii
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$s6 = "operator<=>" fullword ascii
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$s7 = "operator co_await" fullword ascii
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$s8 = ".data$rs" fullword ascii
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$s9 = "tutoyola" fullword ascii
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$s10 = "api-ms-win-appmodel-runtime-l1-1-2" fullword wide
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$s11 = "vector too long" fullword ascii
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$s12 = "wrong protocol type" fullword ascii /* Goodware String - occured 567 times */
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$s13 = "network reset" fullword ascii /* Goodware String - occured 567 times */
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$s14 = "owner dead" fullword ascii /* Goodware String - occured 567 times */
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$s15 = "connection already in progress" fullword ascii /* Goodware String - occured 567 times */
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$s16 = "network down" fullword ascii /* Goodware String - occured 567 times */
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$s17 = "protocol not supported" fullword ascii /* Goodware String - occured 568 times */
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$s18 = "connection aborted" fullword ascii /* Goodware String - occured 568 times */
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$s19 = "network unreachable" fullword ascii /* Goodware String - occured 569 times */
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$s20 = "host unreachable" fullword ascii /* Goodware String - occured 571 times */
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condition:
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uint16(0) == 0x5a4d and filesize < 700KB and
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( pe.imphash() == "ab74ed3f154e02cfafb900acffdabf9e" or all of them )
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}
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rule cobalt_strike_TSE588C {
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meta:
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description = "exe - file TSE588C.exe"
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author = "The DFIR Report"
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reference = "https://thedfirreport.com"
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date = "2021-01-05"
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hash1 = "32c13df5d411bf5a114e2021bbe9ffa5062ed1db91075a55fe4182b3728d62fe"
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strings:
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$s1 = "mneploho86.dll" fullword ascii
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$s2 = "C:\\projects\\Project1\\Project1.pdb" fullword ascii
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$s3 = "AppPolicyGetProcessTerminationMethod" fullword ascii
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$s4 = "AppPolicyGetThreadInitializationType" fullword ascii
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$s5 = "boltostrashno.nfo" fullword ascii
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$s6 = "operator<=>" fullword ascii
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$s7 = "operator co_await" fullword ascii
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$s8 = "?7; ?<= <?= 6<" fullword ascii /* hex encoded string 'v' */
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$s9 = ".data$rs" fullword ascii
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$s10 = "tutoyola" fullword ascii
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$s11 = "Ommk~z#K`majg`i4.itg~\".jkhbozk" fullword ascii
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$s12 = "api-ms-win-appmodel-runtime-l1-1-2" fullword wide
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$s13 = "OVOVPWTOVOWOTF" fullword ascii
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$s14 = "vector too long" fullword ascii
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$s15 = "n>log2" fullword ascii
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$s16 = "\\khk|k|4.fzz~4!!majk d" fullword ascii
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$s17 = "network reset" fullword ascii /* Goodware String - occured 567 times */
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$s18 = "wrong protocol type" fullword ascii /* Goodware String - occured 567 times */
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$s19 = "owner dead" fullword ascii /* Goodware String - occured 567 times */
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$s20 = "connection already in progress" fullword ascii /* Goodware String - occured 567 times */
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condition:
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uint16(0) == 0x5a4d and filesize < 900KB and
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( pe.imphash() == "bb8169128c5096ea026d19888c139f1a" or 10 of them )
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}
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rule CS_encrypted_beacon_x86 {
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meta:
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author = "Etienne Maynier tek@randhome.io"
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strings:
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$s1 = { fc e8 ?? 00 00 00 }
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$s2 = { 8b [1-3] 83 c? 04 [0-1] 8b [1-2] 31 }
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condition:
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$s1 at 0 and $s2 in (0..200) and filesize < 300000
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}
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rule CS_encrypted_beacon_x86_64 {
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meta:
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author = "Etienne Maynier tek@randhome.io"
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strings:
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$s1 = { fc 48 83 e4 f0 eb 33 5d 8b 45 00 48 83 c5 04 8b }
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condition:
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$s1 at 0 and filesize < 300000
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}
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rule CS_beacon {
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meta:
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author = "Etienne Maynier tek@randhome.io"
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strings:
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$s1 = "%02d/%02d/%02d %02d:%02d:%02d" ascii
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$s2 = "%s as %s\\%s: %d" ascii
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$s3 = "Started service %s on %s" ascii
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$s4 = "beacon.dll" ascii
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$s5 = "beacon.x64.dll" ascii
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$s6 = "ReflectiveLoader" ascii
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$s7 = { 2e 2f 2e 2f 2e 2c ?? ?? 2e 2c 2e 2f }
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$s8 = { 69 68 69 68 69 6b ?? ?? 69 6b 69 68 }
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$s9 = "%s (admin)" ascii
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$s10 = "Updater.dll" ascii
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$s11 = "LibTomMath" ascii
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$s12 = "Content-Type: application/octet-stream" ascii
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condition:
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6 of them and filesize < 300000
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}
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