YARA · Malpedia signator rules
MALPEDIA_Win_Nosu_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: Nosu.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-nosu-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Nosu_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "87a7c331-4fc8-531f-8c0e-b4f2be921443"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.nosu"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.nosu_auto.yar#L1-L128"
= "N/A"
= "1adf3314d9aa76b79fcc42dd68812de3d4dd29a38770e39291304cf984cd90d1"
= 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 = { 8bd5 50 51 6a00 6a00 53 bb01000080 }
$sequence_1 = { 50 50 50 8d442420 50 8d8424b4000000 50 }
$sequence_2 = { 59 59 84c0 7448 8d85f8f7ffff }
$sequence_3 = { ff74241c ff36 e8???????? 83c40c 88442404 8d4c2408 e8???????? }
$sequence_4 = { 8b4d08 50 ff7524 ff742414 ff742428 ff751c ff7518 }
$sequence_5 = { 8bf2 8d442410 8b5508 8bf9 50 89742410 e8???????? }
$sequence_6 = { 8bce e8???????? 8d97e0c80300 8d4c2418 e8???????? 8d9718b40300 8d4c2418 }
$sequence_7 = { ff742408 50 8d87d8000000 50 }
$sequence_8 = { 50 56 ff15???????? 85c0 0f95c1 884c2413 85c0 }
$sequence_9 = { 50 56 ff15???????? 85c0 7535 85f6 }
condition:
7 of them and filesize < 513024
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 8bd5 50 51 6a00 6a00 53 bb01000080 } | |
| $sequence_1 | hex | { 50 50 50 8d442420 50 8d8424b4000000 50 } | |
| $sequence_2 | hex | { 59 59 84c0 7448 8d85f8f7ffff } | |
| $sequence_3 | hex | { ff74241c ff36 e8???????? 83c40c 88442404 8d4c2408 e8???????? } | |
| $sequence_4 | hex | { 8b4d08 50 ff7524 ff742414 ff742428 ff751c ff7518 } | |
| $sequence_5 | hex | { 8bf2 8d442410 8b5508 8bf9 50 89742410 e8???????? } | |
| $sequence_6 | hex | { 8bce e8???????? 8d97e0c80300 8d4c2418 e8???????? 8d9718b40300 8d4c2418 } | |
| $sequence_7 | hex | { ff742408 50 8d87d8000000 50 } | |
| $sequence_8 | hex | { 50 56 ff15???????? 85c0 0f95c1 884c2413 85c0 } | |
| $sequence_9 | hex | { 50 56 ff15???????? 85c0 7535 85f6 } |
Condition
7 of them and filesize < 513024In plain words (Heuristic)
- The file must be smaller than 513024 (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: 87a7c331-4fc8-531f-8c0e-b4f2be921443
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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