APT_Dropper_Raw64_TEARDROP_1

YARA detection rule by FireEye · NOASSERTION

This rule looks for portions of the TEARDROP backdoor that are vital to how it functions. TEARDROP is a memory only dropper that can read files and registry keys, XOR decode an embedded payload, and load the payload into memory. TEARDROP persists as a Windows service and has been observed dropping Cobalt Strike BEACON into memory.

rule APT_Dropper_Raw64_TEARDROP_1
{
    meta:
        author = "FireEye"
        description = "This rule looks for portions of the TEARDROP backdoor that are vital to how it functions. TEARDROP is a memory only dropper that can read files and registry keys, XOR decode an embedded payload, and load the payload into memory. TEARDROP persists as a Windows service and has been observed dropping Cobalt Strike BEACON into memory."
        source = "https://github.com/fireeye/sunburst_countermeasures/blob/main/rules/TEARDROP/yara/APT_Dropper_Raw64_TEARDROP_1.yar"
    
    strings:
        $sb1 = { C7 44 24 ?? 80 00 00 00 [0-64] BA 00 00 00 80 [0-32] 48 8D 0D [4-32] FF 15 [4] 48 83 F8 FF [2-64] 41 B8 40 00 00 00 [0-64] FF 15 [4-5] 85 C0 7? ?? 80 3D [4] FF }
        $sb2 = { 80 3D [4] D8 [2-32] 41 B8 04 00 00 00 [0-32] C7 44 24 ?? 4A 46 49 46 [0-32] E8 [4-5] 85 C0 [2-32] C6 05 [4] 6A C6 05 [4] 70 C6 05 [4] 65 C6 05 [4] 67 }
        $sb3 = { BA [4] 48 89 ?? E8 [4] 41 B8 [4] 48 89 ?? 48 89 ?? E8 [4] 85 C0 7? [1-32] 8B 44 24 ?? 48 8B ?? 24 [1-16] 48 01 C8 [0-32] FF D0 }
    condition:
        all of them
}

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

351c47d4-e510-4568-be68-92d4b3fe6107

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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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