YARA · Google Cloud Threat Intelligence (GCTI)
GCTI_Cobaltstrike_Resources_Bypassuac_X64_Dll_V3_3_To_V3_14_And_Sleeve_Bypassuac_X64_Dll_V4_0_And_V4_X
Cobalt Strike's resources/bypassuac-x64.dll from v3.3 to v3.14 (64-bit version) and sleeve/bypassuac.x64.dll from v4.0 to at least v4.4
- Author
- gssincla@google.com
- Date
- 2022-11-18
- Modified
- 2022-11-19
- Score / Quality
- 75 / 85
What this rule detects
Cobalt Strike's resources/bypassuac-x64.dll from v3.3 to v3.14 (64-bit version) and sleeve/bypassuac.x64.dll from v4.0 to at least v4.4
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_Bypassuac_X64_Dll_V3_3_To_V3_14_And_Sleeve_Bypassuac_X64_Dll_V4_0_And_V4_X
{
meta:
= "Cobalt Strike's resources/bypassuac-x64.dll from v3.3 to v3.14 (64-bit version) and sleeve/bypassuac.x64.dll from v4.0 to at least v4.4"
= "gssincla@google.com"
= "eef83901-63d9-55a3-b115-03f420416177"
= "2022-11-18"
= "2022-11-19"
= "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_Bypassuac_x64_Dll_v3_3_to_v3_14_and_Sleeve_Bypassuac_x64_Dll_v4_0_and_v4_x.yara#L17-L86"
= "https://github.com/chronicle/GCTI/blob/1c5fd42b1895098527fde00c2d9757edf6b303bb/LICENSE"
= "9ecf56e9099811c461d592c325c65c4f9f27d947cbdf3b8ef8a98a43e583aecb"
= "d76e3601f61ae164a8df9048d59d15cd6913e64adb93132244e83f40bf67d86a"
= 75
= 85
= ""
strings:
$deleteFileCOM = {
48 8B [5]
45 33 ??
48 8B ??
FF 90 90 00 00 00
85 C0
75 ??
48 8B [5]
48 8B ??
FF 92 A8 00 00 00
85 C0
}
$copyFileCOM = {
48 8B [5]
4C 8B [5]
48 8B [5]
48 8B ??
4C 8B ??
48 89 [3]
FF 90 80 00 00 00
85 C0
0F 85 [4]
48 8B [5]
48 8B 11
FF 92 A8 00 00 00
}
condition:
all of them
}
Strings (2 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $deleteFileCOM | hex | { 48 8B [5] 45 33 ?? 48 8B ?? FF 90 90 00 00 00 85 C0 75 ?? 48 8B [5] 48 8B ?? FF 92 A8 00 00 00 85 C0 } | |
| $copyFileCOM | hex | { 48 8B [5] 4C 8B [5] 48 8B [5] 48 8B ?? 4C 8B ?? 48 89 [3] FF 90 80 00 00 00 85 C0 0F 85 [4] 48 8B [5] 48 8B 11 FF 92 A8 00 … |
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).
- 9ecf56e9099811c461d592c325c65c4f9f27d947cbdf3b8ef8a98a43e583aecb
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: eef83901-63d9-55a3-b115-03f420416177
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