YARA · Google Cloud Threat Intelligence (GCTI)
GCTI_Cobaltstrike_Resources_Beacon_X64_V3_8
Cobalt Strike's sleeve/beacon.x64.dll Versions 3.8
- Author
- gssincla@google.com
- Date
- 2022-11-18
- Modified
- 2023-12-04
- Score / Quality
- 75 / 85
What this rule detects
Cobalt Strike's sleeve/beacon.x64.dll Versions 3.8
Associated malware family: Cobalt Strike.
It defines 2 patterns (0 text, 2 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
rule GCTI_Cobaltstrike_Resources_Beacon_X64_V3_8
{
meta:
= "Cobalt Strike's sleeve/beacon.x64.dll Versions 3.8"
= "gssincla@google.com"
= "89809d81-9a8b-5cf3-a251-689bf52e98e0"
= "2022-11-18"
= "2023-12-04"
= "https://cloud.google.com/blog/products/identity-security/making-cobalt-strike-harder-for-threat-actors-to-abuse"
= "https://github.com/chronicle/GCTI/blob/1c5fd42b1895098527fde00c2d9757edf6b303bb/YARA/CobaltStrike/CobaltStrike__Resources_Beacon_Dll_All_Versions_MemEnabled.yara#L1276-L1310"
= "https://github.com/chronicle/GCTI/blob/1c5fd42b1895098527fde00c2d9757edf6b303bb/LICENSE"
= "547d44669dba97a32cb9e95cfb8d3cd278e00599e6a11080df1a9d09226f33ae"
= "8845b71ce4401fd194eb88f04dbf1f313af8b4853da004e63261ca3158fcb1d4"
= 75
= 85
= ""
strings:
$version_sig = { 8B D3 48 8B CF E8 7A 52 00 00 EB 0D 45 33 C0 8B D3 48 8B CF
E8 8F 55 00 00 }
$decoder = { 80 34 28 ?? 48 FF C0 48 3D 00 10 00 00 7C F1 }
condition:
all of them
}
Strings (2 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $version_sig | hex | { 8B D3 48 8B CF E8 7A 52 00 00 EB 0D 45 33 C0 8B D3 48 8B CF E8 8F 55 00 00 } | |
| $decoder | hex | { 80 34 28 ?? 48 FF C0 48 3D 00 10 00 00 7C F1 } |
Condition
all of themIn plain words (Heuristic)
- All patterns in the rule must match.
Test this rule in your browser
Drop a file to scan it with this rule using YARA-X compiled to WebAssembly. Nothing is uploaded.
Sample hashes
Hashes of samples the author lists in the rule's meta (look them up in your threat-intelligence platform).
- 547d44669dba97a32cb9e95cfb8d3cd278e00599e6a11080df1a9d09226f33ae
Licence & attribution
Author: gssincla@google.com
Source repository: Google Cloud Threat Intelligence (GCTI) @ 1c5fd42b18
Licence: Apache License 2.0 (repository licence)
Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.
Rule id: 89809d81-9a8b-5cf3-a251-689bf52e98e0
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