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MALPEDIA_Win_Mistpen_Auto

autogenerated rule brought to you by yara-signator

MalwareMistpenMalpedia 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: Mistpen.

It defines 10 patterns (0 text, 10 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

win-mistpen-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Mistpen_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "53c9e5a6-10bd-50cf-bfa6-a4f106400457"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.mistpen"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.mistpen_auto.yar#L1-L130"
		license_url = "N/A"
		logic_hash = "c02e63704aa0a669b52b83a02513e9d87ccd1e9e0bfb05d989aca48149964693"
		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 = { f20f5cca f2410f590cc1 660f28d1 660f28c1 4c8d0d3b930000 f20f101d???????? }
		$sequence_1 = { 448bce 4489642428 4c8bc0 33d2 4c89642420 b9e9fd0000 }
		$sequence_2 = { 4c8d3555140100 896b48 40886b24 8a11 48ffc1 e9???????? }
		$sequence_3 = { 4403c2 410bdb 4181c1a1ebd96e 418bc0 c1c81b 8bce 33cb }
		$sequence_4 = { ff15???????? 498bc4 eb4b 428b540010 83fa17 7610 b97f000000 }
		$sequence_5 = { ffc5 418d4c2402 03cd e8???????? 85f6 458be5 }
		$sequence_6 = { 458b8c9460810200 4133bc8490920200 418bc0 41337e20 c1e808 0fb6c8 8bc3 }
		$sequence_7 = { 418bc7 33c7 c1ca1b 4133c5 41c1e21e 05d6c162ca 41c1ed02 }
		$sequence_8 = { 488b05???????? 4833c4 488985e0010000 4c8ba560020000 0f57c0 488b8568020000 4c8bf1 }
		$sequence_9 = { 488d4c2420 e8???????? 488d158f350200 488d4c2420 e8???????? cc 4883ec48 }

	condition:
		7 of them and filesize < 458752
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ f20f5cca f2410f590cc1 660f28d1 660f28c1 4c8d0d3b930000 f20f101d???????? }
$sequence_1hex{ 448bce 4489642428 4c8bc0 33d2 4c89642420 b9e9fd0000 }
$sequence_2hex{ 4c8d3555140100 896b48 40886b24 8a11 48ffc1 e9???????? }
$sequence_3hex{ 4403c2 410bdb 4181c1a1ebd96e 418bc0 c1c81b 8bce 33cb }
$sequence_4hex{ ff15???????? 498bc4 eb4b 428b540010 83fa17 7610 b97f000000 }
$sequence_5hex{ ffc5 418d4c2402 03cd e8???????? 85f6 458be5 }
$sequence_6hex{ 458b8c9460810200 4133bc8490920200 418bc0 41337e20 c1e808 0fb6c8 8bc3 }
$sequence_7hex{ 418bc7 33c7 c1ca1b 4133c5 41c1e21e 05d6c162ca 41c1ed02 }
$sequence_8hex{ 488b05???????? 4833c4 488985e0010000 4c8ba560020000 0f57c0 488b8568020000 4c8bf1 }
$sequence_9hex{ 488d4c2420 e8???????? 488d158f350200 488d4c2420 e8???????? cc 4883ec48 }

Condition

7 of them and filesize < 458752

In plain words (Heuristic)

  • The file must be smaller than 458752 (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: 53c9e5a6-10bd-50cf-bfa6-a4f106400457

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