YARA · Malpedia signator rules
MALPEDIA_Win_Xxmm_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: Xxmm.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-xxmm-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Xxmm_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "8925137d-0454-5308-8167-8499dccc38ba"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.xxmm"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.xxmm_auto.yar#L1-L115"
= "N/A"
= "64701b9777df6a51d947f49047cbe004510d236a53d10ce39dfec60da2ae0f29"
= 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 = { 8b00 03c1 8945e4 eb31 81fbaafc0d7c }
$sequence_1 = { 33d2 8bc6 f7750c 8b4508 0fb60402 0fb6140e 03d8 }
$sequence_2 = { 57 bf00010000 880408 40 }
$sequence_3 = { 394de0 740f 394dec 740a }
$sequence_4 = { 56 57 33ff 8bf0 397d08 0f84bc000000 397d10 }
$sequence_5 = { 4a 75f7 8b5dfc 83c728 }
$sequence_6 = { 33db 33f6 33d2 8bc6 }
$sequence_7 = { 6683ff02 750a 668b7dfc 23c3 66013c08 }
$sequence_8 = { e8???????? 8bd8 895dfc b84d5a0000 663903 7517 8b433c }
$sequence_9 = { 8b540e1c 8d0482 03c1 81fb8e4e0eec }
condition:
7 of them and filesize < 540672
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 8b00 03c1 8945e4 eb31 81fbaafc0d7c } | |
| $sequence_1 | hex | { 33d2 8bc6 f7750c 8b4508 0fb60402 0fb6140e 03d8 } | |
| $sequence_2 | hex | { 57 bf00010000 880408 40 } | |
| $sequence_3 | hex | { 394de0 740f 394dec 740a } | |
| $sequence_4 | hex | { 56 57 33ff 8bf0 397d08 0f84bc000000 397d10 } | |
| $sequence_5 | hex | { 4a 75f7 8b5dfc 83c728 } | |
| $sequence_6 | hex | { 33db 33f6 33d2 8bc6 } | |
| $sequence_7 | hex | { 6683ff02 750a 668b7dfc 23c3 66013c08 } | |
| $sequence_8 | hex | { e8???????? 8bd8 895dfc b84d5a0000 663903 7517 8b433c } | |
| $sequence_9 | hex | { 8b540e1c 8d0482 03c1 81fb8e4e0eec } |
Condition
7 of them and filesize < 540672In plain words (Heuristic)
- The file must be smaller than 540672 (a cheap guard that skips large files).
- At least 7 patterns in the rule must match.
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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: 8925137d-0454-5308-8167-8499dccc38ba
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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