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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:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "e81434be-41f7-5dbf-b190-cfbb6f88c924"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.quirkyloader"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.quirkyloader_auto.yar#L1-L134"
		license_url = "N/A"
		logic_hash = "dafbade4332c5557ac1a53d2d3ddbccba3da8784bd54d2b2045495f2df25fae6"
		score = 75
		quality = 75
		tags = "FILE"
		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"

	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)

IdentifierTypeValueModifiers
$sequence_0hex{ c783a000000002000000 b801000000 eb1d c783a000000003000000 eb05 83fe05 7422 }
$sequence_1hex{ e8???????? 488bd8 488bcb e8???????? 488d0dbd6e0400 488379f800 751a }
$sequence_2hex{ f0440fb102 448b45ec 4533d2 413bc0 410f94c2 448955f0 7411 }
$sequence_3hex{ eb82 488b4590 034580 0f28b424d0000000 0f28bc24c0000000 4881c4e8000000 5b }
$sequence_4hex{ e9???????? 483bda 776a 448b13 458d8a207f7fff 41f7c1f0c0c000 0f8463feffff }
$sequence_5hex{ f7da ffca f00fb111 3b44242c 75e0 83faff 751f }
$sequence_6hex{ e8???????? 4c8bf0 488b5308 498bce e8???????? 488d4b10 498bd6 }
$sequence_7hex{ e8???????? 488bc8 3909 e8???????? b8e7b5ec1f ebab 4881c4c8000000 }
$sequence_8hex{ eb0d 4c8b442430 498bc9 e8???????? 48897c2420 4c8bcf 4489742428 }
$sequence_9hex{ e8???????? 33c9 8b5008 85d2 7e49 90 448bc1 }

Condition

7 of them and filesize < 4722688

In 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.

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References

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)

Original rule

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

version1
toolyara-signator v0.6.0
signator_configcallsandjumps;datarefs;binvalue
malpedia_rule_date20260422
malpedia_hasha182e35da64e6d71cb55f125c4d4225196523f14
malpedia_version20260504
malpedia_licenseCC BY-SA 4.0
malpedia_sharingTLP:WHITE

Tags:FILE