YARA · Malpedia signator rules
MALPEDIA_Win_Gacrux_Auto
autogenerated rule brought to you by yara-signator
- Author
- Felix Bilstein - yara-signator at cocacoding dot com
- Date
- 2026-05-04
- Modified
- 2026-05-18
- Score / Quality
- 75 / 75
What this rule detects
autogenerated rule brought to you by yara-signator
Associated malware family: Gacrux.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-gacrux-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Gacrux_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "9733cb49-68a2-5c86-8977-728c1a5d72e1"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.gacrux"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.gacrux_auto.yar#L1-L121"
= "N/A"
= "374a0770604f45cb64227913029acc0e7a67ac6c7a3ffdfc3a6a671ab2cdc04a"
= 75
= 75
= "FILE"
= "1"
= "yara-signator v0.6.0"
= "callsandjumps;datarefs;binvalue"
= "20260422"
= "a182e35da64e6d71cb55f125c4d4225196523f14"
= "20260504"
= "CC BY-SA 4.0"
= "TLP:WHITE"
strings:
$sequence_0 = { b8f892c087 e9???????? 837c242010 0f82cc000000 ba01000000 41 b84f0df9f3 }
$sequence_1 = { 8aee 45 88700d 41 8ace }
$sequence_2 = { 3c7c 7518 48 63cd e8???????? }
$sequence_3 = { 3bc8 48 0f47ce eb1e 45 0fb70a 41 }
$sequence_4 = { 48 85f6 743b ba01000000 41 b84e323bf7 e8???????? }
$sequence_5 = { b8e697a595 e8???????? 4c 8bc5 }
$sequence_6 = { 40 53 48 83ec20 ba01000000 41 b8817dda68 }
$sequence_7 = { 8d4b40 83631000 ba40000000 48 }
$sequence_8 = { 49 8bce ffd0 48 833f00 }
$sequence_9 = { 8b0d???????? 8bd5 44 0fb605???????? 44 8b0d???????? }
condition:
7 of them and filesize < 122880
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { b8f892c087 e9???????? 837c242010 0f82cc000000 ba01000000 41 b84f0df9f3 } | |
| $sequence_1 | hex | { 8aee 45 88700d 41 8ace } | |
| $sequence_2 | hex | { 3c7c 7518 48 63cd e8???????? } | |
| $sequence_3 | hex | { 3bc8 48 0f47ce eb1e 45 0fb70a 41 } | |
| $sequence_4 | hex | { 48 85f6 743b ba01000000 41 b84e323bf7 e8???????? } | |
| $sequence_5 | hex | { b8e697a595 e8???????? 4c 8bc5 } | |
| $sequence_6 | hex | { 40 53 48 83ec20 ba01000000 41 b8817dda68 } | |
| $sequence_7 | hex | { 8d4b40 83631000 ba40000000 48 } | |
| $sequence_8 | hex | { 49 8bce ffd0 48 833f00 } | |
| $sequence_9 | hex | { 8b0d???????? 8bd5 44 0fb605???????? 44 8b0d???????? } |
Condition
7 of them and filesize < 122880In plain words (Heuristic)
- The file must be smaller than 122880 (a cheap guard that skips large files).
- At least 7 patterns in the rule must match.
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Licence & attribution
Author: Felix Bilstein - yara-signator at cocacoding dot com
Source repository: Malpedia signator rules @ c901f97b7d
Licence: Creative Commons Attribution-ShareAlike 4.0 (repository licence)
Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.
Rule id: 9733cb49-68a2-5c86-8977-728c1a5d72e1
Metadata
| version | 1 |
|---|---|
| tool | yara-signator v0.6.0 |
| signator_config | callsandjumps;datarefs;binvalue |
| malpedia_rule_date | 20260422 |
| malpedia_hash | a182e35da64e6d71cb55f125c4d4225196523f14 |
| malpedia_version | 20260504 |
| malpedia_license | CC BY-SA 4.0 |
| malpedia_sharing | TLP:WHITE |
Tags:FILE
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