YARA · Malpedia signator rules
MALPEDIA_Win_Quirkyloader_Auto
autogenerated rule brought to you by yara-signator
MalwareQuirkyloaderMalpedia 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: Quirkyloader.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-quirkyloader-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Quirkyloader_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "e81434be-41f7-5dbf-b190-cfbb6f88c924"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.quirkyloader"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.quirkyloader_auto.yar#L1-L134"
= "N/A"
= "dafbade4332c5557ac1a53d2d3ddbccba3da8784bd54d2b2045495f2df25fae6"
= 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 = { c783a000000002000000 b801000000 eb1d c783a000000003000000 eb05 83fe05 7422 }
$sequence_1 = { e8???????? 488bd8 488bcb e8???????? 488d0dbd6e0400 488379f800 751a }
$sequence_2 = { f0440fb102 448b45ec 4533d2 413bc0 410f94c2 448955f0 7411 }
$sequence_3 = { eb82 488b4590 034580 0f28b424d0000000 0f28bc24c0000000 4881c4e8000000 5b }
$sequence_4 = { e9???????? 483bda 776a 448b13 458d8a207f7fff 41f7c1f0c0c000 0f8463feffff }
$sequence_5 = { f7da ffca f00fb111 3b44242c 75e0 83faff 751f }
$sequence_6 = { e8???????? 4c8bf0 488b5308 498bce e8???????? 488d4b10 498bd6 }
$sequence_7 = { e8???????? 488bc8 3909 e8???????? b8e7b5ec1f ebab 4881c4c8000000 }
$sequence_8 = { eb0d 4c8b442430 498bc9 e8???????? 48897c2420 4c8bcf 4489742428 }
$sequence_9 = { e8???????? 33c9 8b5008 85d2 7e49 90 448bc1 }
condition:
7 of them and filesize < 4722688
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { c783a000000002000000 b801000000 eb1d c783a000000003000000 eb05 83fe05 7422 } | |
| $sequence_1 | hex | { e8???????? 488bd8 488bcb e8???????? 488d0dbd6e0400 488379f800 751a } | |
| $sequence_2 | hex | { f0440fb102 448b45ec 4533d2 413bc0 410f94c2 448955f0 7411 } | |
| $sequence_3 | hex | { eb82 488b4590 034580 0f28b424d0000000 0f28bc24c0000000 4881c4e8000000 5b } | |
| $sequence_4 | hex | { e9???????? 483bda 776a 448b13 458d8a207f7fff 41f7c1f0c0c000 0f8463feffff } | |
| $sequence_5 | hex | { f7da ffca f00fb111 3b44242c 75e0 83faff 751f } | |
| $sequence_6 | hex | { e8???????? 4c8bf0 488b5308 498bce e8???????? 488d4b10 498bd6 } | |
| $sequence_7 | hex | { e8???????? 488bc8 3909 e8???????? b8e7b5ec1f ebab 4881c4c8000000 } | |
| $sequence_8 | hex | { eb0d 4c8b442430 498bc9 e8???????? 48897c2420 4c8bcf 4489742428 } | |
| $sequence_9 | hex | { e8???????? 33c9 8b5008 85d2 7e49 90 448bc1 } |
Condition
7 of them and filesize < 4722688In plain words (Heuristic)
- The file must be smaller than 4722688 (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: e81434be-41f7-5dbf-b190-cfbb6f88c924
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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