YARA · Malpedia signator rules
MALPEDIA_Win_Gandcrab_Auto
autogenerated rule brought to you by yara-signator
MalwareGandcrabMalpedia signator rulesCreative Commons Attribution-ShareAlike 4.0Compiles with YARA-X
- 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: Gandcrab.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-gandcrab-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Gandcrab_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "edf9d73e-47bb-5498-8314-d2a26c7eb915"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.gandcrab"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.gandcrab_auto.yar#L1-L119"
= "N/A"
= "8e0dc2dc5f594011ff141e52d0970e654fe224cfb5f2cb26869ab34c100952d0"
= 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 = { ff7744 ff15???????? ff7740 8bf0 ff15???????? 03c3 }
$sequence_1 = { ff15???????? ff7728 8bf0 ff15???????? 03c3 8d5e04 }
$sequence_2 = { ff15???????? 03c3 8d5e04 03d8 837f4800 741b }
$sequence_3 = { ff15???????? ff7740 8bf0 ff15???????? 03c3 }
$sequence_4 = { 03c3 8d5e04 03d8 837f3000 741b ff7738 ff15???????? }
$sequence_5 = { 837f7400 741b ff777c ff15???????? ff7778 8bf0 }
$sequence_6 = { ff777c ff15???????? ff7778 8bf0 ff15???????? }
$sequence_7 = { ff7738 ff15???????? ff7734 8bf0 ff15???????? }
$sequence_8 = { 741b ff7750 ff15???????? ff774c }
$sequence_9 = { 03c3 8d5e04 03d8 837f3000 741b }
condition:
7 of them and filesize < 1024000
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { ff7744 ff15???????? ff7740 8bf0 ff15???????? 03c3 } | |
| $sequence_1 | hex | { ff15???????? ff7728 8bf0 ff15???????? 03c3 8d5e04 } | |
| $sequence_2 | hex | { ff15???????? 03c3 8d5e04 03d8 837f4800 741b } | |
| $sequence_3 | hex | { ff15???????? ff7740 8bf0 ff15???????? 03c3 } | |
| $sequence_4 | hex | { 03c3 8d5e04 03d8 837f3000 741b ff7738 ff15???????? } | |
| $sequence_5 | hex | { 837f7400 741b ff777c ff15???????? ff7778 8bf0 } | |
| $sequence_6 | hex | { ff777c ff15???????? ff7778 8bf0 ff15???????? } | |
| $sequence_7 | hex | { ff7738 ff15???????? ff7734 8bf0 ff15???????? } | |
| $sequence_8 | hex | { 741b ff7750 ff15???????? ff774c } | |
| $sequence_9 | hex | { 03c3 8d5e04 03d8 837f3000 741b } |
Condition
7 of them and filesize < 1024000In plain words (Heuristic)
- The file must be smaller than 1024000 (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: edf9d73e-47bb-5498-8314-d2a26c7eb915
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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