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MALPEDIA_Win_Fk_Undead_Auto

autogenerated rule brought to you by yara-signator

MalwareFk UndeadMalpedia 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: Fk Undead.

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

Summary generated from the rule's metadata and condition.

Rule source

win-fk-undead-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Fk_Undead_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "02969aed-17bc-5bd4-8372-32190b9962f6"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.fk_undead"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.fk_undead_auto.yar#L1-L131"
		license_url = "N/A"
		logic_hash = "568a37848273d11f37d140c220bd173a6167b00475b69ffcde402633d902008d"
		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 = { 83c002 6685c9 75f5 2bc2 d1f8 83f816 7607 }
		$sequence_1 = { 52 53 53 50 57 68c0300800 56 }
		$sequence_2 = { 7416 8b450c 854160 740e b901000000 33c0 85c9 }
		$sequence_3 = { 52 e8???????? 8bf8 83c404 897c2410 85ff 0f84ad000000 }
		$sequence_4 = { 83fa03 750e 8b0c85e0650a10 8a06 46 88441926 2bf2 }
		$sequence_5 = { 7407 50 ff15???????? 57 ff15???????? 8b442410 }
		$sequence_6 = { 0fb74d1c 894c2420 8b4d24 89542424 8b5520 894c2454 0fb64d0a }
		$sequence_7 = { 52 e8???????? 83c410 89442438 3bc6 0f8430010000 }
		$sequence_8 = { 0f84a4020000 c7461801000000 e9???????? 803f0a 7533 837e2000 }
		$sequence_9 = { 33db 48 ff248d84b40010 8d543e5e 8b443e18 8b5c3e3c 8944244c }

	condition:
		7 of them and filesize < 1418240
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 83c002 6685c9 75f5 2bc2 d1f8 83f816 7607 }
$sequence_1hex{ 52 53 53 50 57 68c0300800 56 }
$sequence_2hex{ 7416 8b450c 854160 740e b901000000 33c0 85c9 }
$sequence_3hex{ 52 e8???????? 8bf8 83c404 897c2410 85ff 0f84ad000000 }
$sequence_4hex{ 83fa03 750e 8b0c85e0650a10 8a06 46 88441926 2bf2 }
$sequence_5hex{ 7407 50 ff15???????? 57 ff15???????? 8b442410 }
$sequence_6hex{ 0fb74d1c 894c2420 8b4d24 89542424 8b5520 894c2454 0fb64d0a }
$sequence_7hex{ 52 e8???????? 83c410 89442438 3bc6 0f8430010000 }
$sequence_8hex{ 0f84a4020000 c7461801000000 e9???????? 803f0a 7533 837e2000 }
$sequence_9hex{ 33db 48 ff248d84b40010 8d543e5e 8b443e18 8b5c3e3c 8944244c }

Condition

7 of them and filesize < 1418240

In plain words (Heuristic)

  • The file must be smaller than 1418240 (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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Drop a file here or click to chooseScanned locally with YARA-X. Files up to 200 MB.

Open in editor

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: 02969aed-17bc-5bd4-8372-32190b9962f6

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