Cobaltbaltstrike_Payload_Encoded

YARA detection rule by Avast Threat Intel Team · NOASSERTION

Detects CobaltStrike payloads

rule Cobaltbaltstrike_Payload_Encoded
{
  meta:
    author = "Avast Threat Intel Team"
    description = "Detects CobaltStrike payloads"
    reference = "https://github.com/avast/ioc"
    id = "b5176740-2dda-5e5d-8c0f-47a27846753d"
  strings:
        $s01 = "0xfc, 0xe8, 0x89, 0x00, 0x00, 0x00, 0x60, 0x89, 0xe5, 0x31, 0xd2, 0x64, 0x8b, 0x52, 0x30, 0x8b" ascii wide nocase
    $s02 = "0xfc,0xe8,0x89,0x00,0x00,0x00,0x60,0x89,0xe5,0x31,0xd2,0x64,0x8b,0x52,0x30,0x8b" ascii wide nocase
        $s03 = "0xfc, 0x48, 0x83, 0xe4, 0xf0, 0xe8, 0xc8, 0x00, 0x00, 0x00, 0x41, 0x51, 0x41, 0x50, 0x52, 0x51" ascii wide nocase
    $s04 = "0xfc,0x48,0x83,0xe4,0xf0,0xe8,0xc8,0x00,0x00,0x00,0x41,0x51,0x41,0x50,0x52,0x51" ascii wide nocase
        $s05 = "fce8890000006089e531d2648b52308b" ascii wide nocase
    $s06 = "fc e8 89 00 00 00 60 89 e5 31 d2 64 8b 52 30 8b" ascii wide nocase
        $s07 = "fc4883e4f0e8c8000000415141505251" ascii wide nocase
    $s08 = "fc 48 83 e4 f0 e8 c8 00 00 00 41 51 41 50 52 51" ascii wide nocase
        $s09 = "/OiJAAAAYInlMdJki1Iwi1IMi1IUi3IoD7dKJjH/McCsPGF8Aiwgwc8NAcfi8FJX" ascii wide
        $s10 = "/EiD5PDoyAAAAEFRQVBSUVZIMdJlSItSYEiLUhhIi1IgSItyUEgPt0pKTTHJSDHA" ascii wide
        $s11 = "38uqIyMjQ6rGEvFHqHETqHEvqHE3qFELLJRpBRLcEuOPH0JfIQ8D4uwuIuTB03F0" ascii wide
        $s12 = "32ugx9PL6yMjI2JyYnNxcnVrEvFGa6hxQ2uocTtrqHEDa6hRc2sslGlpbhLqaxLj" ascii wide
        $s13 = "/ADoAIkAAAAAAAAAYACJAOUAMQDSAGQAiwBSADAAiwBSAAwAiwBSABQAiwByACg" ascii wide
        $s14 = "/ABIAIMA5ADwAOgAyAAAAAAAAABBAFEAQQBQAFIAUQBWAEgAMQDSAGUASACLAFI" ascii wide
        $s15 = "3yPLI6ojIyMjIyMjQyOqI8YjEiPxI0cjqCNxIxMjqCNxIy8jqCNxIzcjqCNRIwsj" ascii wide
        $s16 = "3yNrI6AjxyPTI8sj6yMjIyMjIyNiI3IjYiNzI3EjciN1I2sjEiPxI0YjayOoI3Ej" ascii wide
        $s17 = "Array(-4,-24,-119,0,0,0,96,-119,-27,49,-46,100,-117,82,48,-117" ascii wide
    $s18 = "Array(-4, -24, -119, 0, 0, 0, 96, -119, -27, 49, -46, 100, -117, 82, 48, -117" ascii wide
        $s19 = "Array(-4,72,-125,-28,-16,-24,-56,0,0,0,65,81,65,80,82,81" ascii wide
    $s20 = "Array(-4, 72, -125, -28, -16, -24, -56, 0, 0, 0, 65, 81, 65, 80, 82, 81" ascii wide
        $s21 = "Chr(-4)&Chr(-24)&Chr(-119)&Chr(0)&Chr(0)&Chr(0)&Chr(96)&Chr(-119)&Chr(-27)&\"1\"&Chr(-46)&\"d\"&Chr(-117)&\"R0\"&Chr(-117)" ascii wide
        $s22 = "Chr(-4)&\"H\"&Chr(-125)&Chr(-28)&Chr(-16)&Chr(-24)&Chr(-56)&Chr(0)&Chr(0)&Chr(0)&\"AQAPRQVH" ascii wide
        $s23 = "\\xfc\\xe8\\x89\\x00\\x00\\x00\\x60\\x89\\xe5\\x31\\xd2\\x64\\x8b\\x52\\x30\\x8b" ascii wide nocase
        $s24 = "\\xfc\\x48\\x83\\xe4\\xf0\\xe8\\xc8\\x00\\x00\\x00\\x41\\x51\\x41\\x50\\x52\\x51" ascii wide nocase

  condition:
        any of them
}

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

cee6ec0b-b116-4f36-a4e4-5c952ad43f71

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Executable code, not a declarative rule

This submission is arbitrary [[ currentRule.format ? currentRule.format.toUpperCase() : '' ]] code, not a declarative detection rule — review it as you would any script before running it, and note that it cannot be safely aggregated or auto-executed alongside YARA/Sigma/Suricata/CRS rules.

Rejected pattern present

[[ reason ]]

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Format & documentation suggestions

Not a security issue — this rule is valid and was accepted as-is. These are optional fields/conventions its own format recommends, mainly affecting its quality score and how well it documents itself for other reviewers.

[[ reason ]]

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[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

[[ currentRule.title ]]

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