YARA · Malpedia signator rules
MALPEDIA_Win_Crutch_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: Crutch.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-crutch-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Crutch_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "d63fa81a-07ba-55b3-8bb8-045f4b262f08"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.crutch"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.crutch_auto.yar#L1-L133"
= "N/A"
= "213c609e9b29ee190c895c04753435a224af0226ad85ba77de7f13f29e25c692"
= 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 = { 8b15???????? 50 8b4240 ffd0 c744246800000000 c744246000000000 81ff12030900 }
$sequence_1 = { 50 ff15???????? 83c404 894708 85c0 7430 2b8670010000 }
$sequence_2 = { 3bce 7506 8b7c2428 eb4a 41 51 ff15???????? }
$sequence_3 = { c3 6a00 b8???????? e8???????? be???????? 56 }
$sequence_4 = { 0f4385a0fdffff 50 8d85b8fdffff 50 e8???????? 83c424 8d85b8fdffff }
$sequence_5 = { 8806 8a01 46 41 84c0 7405 83ef01 }
$sequence_6 = { 751d f686a001000001 7514 68???????? 56 e8???????? 89aea0020000 }
$sequence_7 = { 51 e8???????? 83c40c 83f801 7527 8b8e14060000 51 }
$sequence_8 = { 8b7510 83fe01 0f8cc0010000 8b048de06f0710 8b3c8ddc6f0710 2bc7 c745d464000000 }
$sequence_9 = { 51 68???????? aa e8???????? 6a0f e8???????? 8bf0 }
condition:
7 of them and filesize < 1067008
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 8b15???????? 50 8b4240 ffd0 c744246800000000 c744246000000000 81ff12030900 } | |
| $sequence_1 | hex | { 50 ff15???????? 83c404 894708 85c0 7430 2b8670010000 } | |
| $sequence_2 | hex | { 3bce 7506 8b7c2428 eb4a 41 51 ff15???????? } | |
| $sequence_3 | hex | { c3 6a00 b8???????? e8???????? be???????? 56 } | |
| $sequence_4 | hex | { 0f4385a0fdffff 50 8d85b8fdffff 50 e8???????? 83c424 8d85b8fdffff } | |
| $sequence_5 | hex | { 8806 8a01 46 41 84c0 7405 83ef01 } | |
| $sequence_6 | hex | { 751d f686a001000001 7514 68???????? 56 e8???????? 89aea0020000 } | |
| $sequence_7 | hex | { 51 e8???????? 83c40c 83f801 7527 8b8e14060000 51 } | |
| $sequence_8 | hex | { 8b7510 83fe01 0f8cc0010000 8b048de06f0710 8b3c8ddc6f0710 2bc7 c745d464000000 } | |
| $sequence_9 | hex | { 51 68???????? aa e8???????? 6a0f e8???????? 8bf0 } |
Condition
7 of them and filesize < 1067008In plain words (Heuristic)
- The file must be smaller than 1067008 (a cheap guard that skips large files).
- At least 7 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.
Drop a file here or click to chooseScanned locally with YARA-X. Files up to 200 MB.
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: d63fa81a-07ba-55b3-8bb8-045f4b262f08
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
Related rules
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04