YARA · Malpedia signator rules
MALPEDIA_Win_Mim221_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: Mim221.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-mim221-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Mim221_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "6b3ca20b-0128-5dd4-ae44-a9ad20468513"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.mim221"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.mim221_auto.yar#L1-L130"
= "N/A"
= "c8ab0bebcf8a5d049b64e0dbc52faacc83c56fe19f5796af9fe2c171bbbea243"
= 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 = { 488d542450 488d4c2460 41b868000000 e8???????? 413bc6 746a 488b842460010000 }
$sequence_1 = { 7408 8bcb ff15???????? 48897c2448 e8???????? 488d1ddaf10000 488d3dfbf10000 }
$sequence_2 = { 33d2 458d462e 488d8c24ca000000 e8???????? c684249003000044 c68424910300008b c684249203000001 }
$sequence_3 = { e8???????? 4c8b1d???????? 4c3bdd 760b }
$sequence_4 = { c784241c07000004000000 e8???????? c784244007000000280000 899c2448070000 488d842490080000 488d8c2470070000 4c8bc6 }
$sequence_5 = { e8???????? 413bc7 7424 48634f30 4c8d4530 488d542450 }
$sequence_6 = { 488b4310 80784900 7513 488bd8 488b00 80784900 74f4 }
$sequence_7 = { 66c74424447300 66c74424464900 66c74424486e00 66c744244a6300 66c744244c7200 66896c244e 66c74424506d00 }
$sequence_8 = { 0f8c3fffffff 4585ff 745e 488b442450 c64424600d 488d0df47d0100 488b0cc1 }
$sequence_9 = { 8b842404010000 4903c4 4889442470 8b8424f8000000 4a8b0c20 48894c2458 4c8b8788000000 }
condition:
7 of them and filesize < 471040
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 488d542450 488d4c2460 41b868000000 e8???????? 413bc6 746a 488b842460010000 } | |
| $sequence_1 | hex | { 7408 8bcb ff15???????? 48897c2448 e8???????? 488d1ddaf10000 488d3dfbf10000 } | |
| $sequence_2 | hex | { 33d2 458d462e 488d8c24ca000000 e8???????? c684249003000044 c68424910300008b c684249203000001 } | |
| $sequence_3 | hex | { e8???????? 4c8b1d???????? 4c3bdd 760b } | |
| $sequence_4 | hex | { c784241c07000004000000 e8???????? c784244007000000280000 899c2448070000 488d842490080000 488d8c2470070000 4c8bc6 } | |
| $sequence_5 | hex | { e8???????? 413bc7 7424 48634f30 4c8d4530 488d542450 } | |
| $sequence_6 | hex | { 488b4310 80784900 7513 488bd8 488b00 80784900 74f4 } | |
| $sequence_7 | hex | { 66c74424447300 66c74424464900 66c74424486e00 66c744244a6300 66c744244c7200 66896c244e 66c74424506d00 } | |
| $sequence_8 | hex | { 0f8c3fffffff 4585ff 745e 488b442450 c64424600d 488d0df47d0100 488b0cc1 } | |
| $sequence_9 | hex | { 8b842404010000 4903c4 4889442470 8b8424f8000000 4a8b0c20 48894c2458 4c8b8788000000 } |
Condition
7 of them and filesize < 471040In plain words (Heuristic)
- The file must be smaller than 471040 (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: 6b3ca20b-0128-5dd4-ae44-a9ad20468513
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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