YARA · Malpedia signator rules
MALPEDIA_Win_Mistpen_Auto
autogenerated rule brought to you by yara-signator
MalwareMistpenMalpedia 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: Mistpen.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-mistpen-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Mistpen_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "53c9e5a6-10bd-50cf-bfa6-a4f106400457"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.mistpen"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.mistpen_auto.yar#L1-L130"
= "N/A"
= "c02e63704aa0a669b52b83a02513e9d87ccd1e9e0bfb05d989aca48149964693"
= 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 = { f20f5cca f2410f590cc1 660f28d1 660f28c1 4c8d0d3b930000 f20f101d???????? }
$sequence_1 = { 448bce 4489642428 4c8bc0 33d2 4c89642420 b9e9fd0000 }
$sequence_2 = { 4c8d3555140100 896b48 40886b24 8a11 48ffc1 e9???????? }
$sequence_3 = { 4403c2 410bdb 4181c1a1ebd96e 418bc0 c1c81b 8bce 33cb }
$sequence_4 = { ff15???????? 498bc4 eb4b 428b540010 83fa17 7610 b97f000000 }
$sequence_5 = { ffc5 418d4c2402 03cd e8???????? 85f6 458be5 }
$sequence_6 = { 458b8c9460810200 4133bc8490920200 418bc0 41337e20 c1e808 0fb6c8 8bc3 }
$sequence_7 = { 418bc7 33c7 c1ca1b 4133c5 41c1e21e 05d6c162ca 41c1ed02 }
$sequence_8 = { 488b05???????? 4833c4 488985e0010000 4c8ba560020000 0f57c0 488b8568020000 4c8bf1 }
$sequence_9 = { 488d4c2420 e8???????? 488d158f350200 488d4c2420 e8???????? cc 4883ec48 }
condition:
7 of them and filesize < 458752
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { f20f5cca f2410f590cc1 660f28d1 660f28c1 4c8d0d3b930000 f20f101d???????? } | |
| $sequence_1 | hex | { 448bce 4489642428 4c8bc0 33d2 4c89642420 b9e9fd0000 } | |
| $sequence_2 | hex | { 4c8d3555140100 896b48 40886b24 8a11 48ffc1 e9???????? } | |
| $sequence_3 | hex | { 4403c2 410bdb 4181c1a1ebd96e 418bc0 c1c81b 8bce 33cb } | |
| $sequence_4 | hex | { ff15???????? 498bc4 eb4b 428b540010 83fa17 7610 b97f000000 } | |
| $sequence_5 | hex | { ffc5 418d4c2402 03cd e8???????? 85f6 458be5 } | |
| $sequence_6 | hex | { 458b8c9460810200 4133bc8490920200 418bc0 41337e20 c1e808 0fb6c8 8bc3 } | |
| $sequence_7 | hex | { 418bc7 33c7 c1ca1b 4133c5 41c1e21e 05d6c162ca 41c1ed02 } | |
| $sequence_8 | hex | { 488b05???????? 4833c4 488985e0010000 4c8ba560020000 0f57c0 488b8568020000 4c8bf1 } | |
| $sequence_9 | hex | { 488d4c2420 e8???????? 488d158f350200 488d4c2420 e8???????? cc 4883ec48 } |
Condition
7 of them and filesize < 458752In plain words (Heuristic)
- The file must be smaller than 458752 (a cheap guard that skips large files).
- At least 7 patterns in the rule must match.
Test this rule in your browser
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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: 53c9e5a6-10bd-50cf-bfa6-a4f106400457
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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