YARA · Malpedia signator rules
MALPEDIA_Win_Mrac_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: Mrac.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-mrac-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Mrac_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "88171e5e-9c24-5782-abfb-8337ed9a4dfa"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.mrac"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.mrac_auto.yar#L1-L133"
= "N/A"
= "e11a99e612e507640597f11e8b4184164080099e30421a7ac342c05566021711"
= 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 = { 88842475060000 e8???????? 3451 8d8c2464060000 6a0b 88842476060000 e8???????? }
$sequence_1 = { 888424eb020000 8b8424dc020000 040c 3420 888424ec020000 8b8424dc020000 040d }
$sequence_2 = { c68424c804000025 c68424c904000043 c68424ca04000053 c68424cb0400005a c68424cc04000051 c68424cd04000025 c68424ce04000037 }
$sequence_3 = { 0407 3453 8845a7 8b459c 0408 3465 }
$sequence_4 = { c3 682680acc8 ba01000000 33c9 e8???????? 83c404 56 }
$sequence_5 = { 8d8c2418030000 6a43 8884242d030000 e8???????? 0463 8d8c2418030000 6a43 }
$sequence_6 = { e8???????? 8bc8 e8???????? 6a00 8d8c2438080000 c784243808000062000000 e8???????? }
$sequence_7 = { c644242100 8a442410 e8???????? 8bc8 e8???????? 6a49 8d4c2450 }
$sequence_8 = { c684241402000079 c68424150200007a c684241602000075 c684241702000076 c684241802000026 c68424190200004b c684241a02000079 }
$sequence_9 = { c684244b0900006c c684244c0900007e c684244d09000072 c684244e0900007e c684244f0900001f c684245009000010 c684245109000046 }
condition:
7 of them and filesize < 745472
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 88842475060000 e8???????? 3451 8d8c2464060000 6a0b 88842476060000 e8???????? } | |
| $sequence_1 | hex | { 888424eb020000 8b8424dc020000 040c 3420 888424ec020000 8b8424dc020000 040d } | |
| $sequence_2 | hex | { c68424c804000025 c68424c904000043 c68424ca04000053 c68424cb0400005a c68424cc04000051 c68424cd04000025 c68424ce04000037 } | |
| $sequence_3 | hex | { 0407 3453 8845a7 8b459c 0408 3465 } | |
| $sequence_4 | hex | { c3 682680acc8 ba01000000 33c9 e8???????? 83c404 56 } | |
| $sequence_5 | hex | { 8d8c2418030000 6a43 8884242d030000 e8???????? 0463 8d8c2418030000 6a43 } | |
| $sequence_6 | hex | { e8???????? 8bc8 e8???????? 6a00 8d8c2438080000 c784243808000062000000 e8???????? } | |
| $sequence_7 | hex | { c644242100 8a442410 e8???????? 8bc8 e8???????? 6a49 8d4c2450 } | |
| $sequence_8 | hex | { c684241402000079 c68424150200007a c684241602000075 c684241702000076 c684241802000026 c68424190200004b c684241a02000079 } | |
| $sequence_9 | hex | { c684244b0900006c c684244c0900007e c684244d09000072 c684244e0900007e c684244f0900001f c684245009000010 c684245109000046 } |
Condition
7 of them and filesize < 745472In plain words (Heuristic)
- The file must be smaller than 745472 (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: 88171e5e-9c24-5782-abfb-8337ed9a4dfa
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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