YARA · Malpedia signator rules
MALPEDIA_Win_Meow_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: Meow.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-meow-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Meow_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "b5de81e8-1f44-5e30-8176-d20d508f6961"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.meow"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.meow_auto.yar#L1-L127"
= "N/A"
= "19192ecf084d89611de05e02f6080f20d3a66cb4fa252b82b0945c52f2f7f8e2"
= 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 = { c685eafeffff03 c685ebfeffff7a c685ecfeffff03 c685edfeffff70 c685eefeffff03 c685effeffff04 c685f0feffff03 }
$sequence_1 = { 8b5df0 2bc3 8b7d30 3bf8 772f 83f908 8d043b }
$sequence_2 = { 0f434d08 57 8975ec 66837c41fe5c 0f859d000000 c645f800 }
$sequence_3 = { 8d4d90 c6459000 c645916c c6459205 c645936d }
$sequence_4 = { 0fb6c0 83e848 8d04c0 99 f7fb 8d427f 99 }
$sequence_5 = { c685f5f9ffff6d c685f6f9ffff0f c685f7f9ffff5b c685f8f9ffff0f 8d8df0f9ffff c685f9f9ffff0f }
$sequence_6 = { c68555f8ffff52 c68556f8ffff05 c68557f8ffff63 c68558f8ffff05 c68559f8ffff77 c6855af8ffff05 8d8d50f8ffff }
$sequence_7 = { c6858ffeffff6c c68590feffff29 c68591feffff0a c68592feffff29 c68593feffff7c }
$sequence_8 = { c6459b28 c6459c5f c6459d55 c6459e5f c6459f67 c645a05f }
$sequence_9 = { 7540 33f6 8d7e7f 0f1f4000 0f1f840000000000 8a843545ffffff 0fb6c8 }
condition:
7 of them and filesize < 492544
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { c685eafeffff03 c685ebfeffff7a c685ecfeffff03 c685edfeffff70 c685eefeffff03 c685effeffff04 c685f0feffff03 } | |
| $sequence_1 | hex | { 8b5df0 2bc3 8b7d30 3bf8 772f 83f908 8d043b } | |
| $sequence_2 | hex | { 0f434d08 57 8975ec 66837c41fe5c 0f859d000000 c645f800 } | |
| $sequence_3 | hex | { 8d4d90 c6459000 c645916c c6459205 c645936d } | |
| $sequence_4 | hex | { 0fb6c0 83e848 8d04c0 99 f7fb 8d427f 99 } | |
| $sequence_5 | hex | { c685f5f9ffff6d c685f6f9ffff0f c685f7f9ffff5b c685f8f9ffff0f 8d8df0f9ffff c685f9f9ffff0f } | |
| $sequence_6 | hex | { c68555f8ffff52 c68556f8ffff05 c68557f8ffff63 c68558f8ffff05 c68559f8ffff77 c6855af8ffff05 8d8d50f8ffff } | |
| $sequence_7 | hex | { c6858ffeffff6c c68590feffff29 c68591feffff0a c68592feffff29 c68593feffff7c } | |
| $sequence_8 | hex | { c6459b28 c6459c5f c6459d55 c6459e5f c6459f67 c645a05f } | |
| $sequence_9 | hex | { 7540 33f6 8d7e7f 0f1f4000 0f1f840000000000 8a843545ffffff 0fb6c8 } |
Condition
7 of them and filesize < 492544In plain words (Heuristic)
- The file must be smaller than 492544 (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: b5de81e8-1f44-5e30-8176-d20d508f6961
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