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MALPEDIA_Win_Stealhook_Auto

autogenerated rule brought to you by yara-signator

MalwareStealhookMalpedia 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: Stealhook.

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

Summary generated from the rule's metadata and condition.

Rule source

win-stealhook-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Stealhook_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "296f5aee-ffa1-5f36-a21a-4cf73eb93c5f"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.stealhook"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.stealhook_auto.yar#L1-L133"
		license_url = "N/A"
		logic_hash = "43462dcbe834192ff5f679907343d7b590d011b91e19ec61f90c0466a187568e"
		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 = { f20f59ee f20f5ce9 f2410f1004c1 488d1536f50000 f20f1014c2 f20f1025???????? f20f59e6 }
		$sequence_1 = { 33d2 e8???????? 48894720 488d0d34550400 807b5604 7704 488b4b40 }
		$sequence_2 = { 48894c2428 4533ff 488d15ff220700 33c9 e8???????? 488b4310 48837b1807 }
		$sequence_3 = { 4883ec20 488d0537f50200 488bda 4a8b04c0 483902 7416 8b81a8030000 }
		$sequence_4 = { 4533c0 45894320 488d056ac60600 488901 4c8981b8000000 4c8981c0000000 448981c8000000 }
		$sequence_5 = { 488b8c2428010000 e8???????? 4c8d842470180000 bae8030000 488d8c2480040000 e8???????? 33db }
		$sequence_6 = { 488d05fa930600 49894408f0 488b07 4c634004 458d48f0 45894c08ec 488d05de920600 }
		$sequence_7 = { 488b07 4c634004 488d05fa930600 49894408f0 488b07 4c634004 }
		$sequence_8 = { 722b 410fb609 41ffc0 83e10f 4a0fbe8431389a0600 428a8c31489a0600 4c2bc8 }
		$sequence_9 = { 4c896c2428 4c897c2420 e8???????? 84c0 0f8493feffff 4c8d25ed540200 49391f }

	condition:
		7 of them and filesize < 1129472
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ f20f59ee f20f5ce9 f2410f1004c1 488d1536f50000 f20f1014c2 f20f1025???????? f20f59e6 }
$sequence_1hex{ 33d2 e8???????? 48894720 488d0d34550400 807b5604 7704 488b4b40 }
$sequence_2hex{ 48894c2428 4533ff 488d15ff220700 33c9 e8???????? 488b4310 48837b1807 }
$sequence_3hex{ 4883ec20 488d0537f50200 488bda 4a8b04c0 483902 7416 8b81a8030000 }
$sequence_4hex{ 4533c0 45894320 488d056ac60600 488901 4c8981b8000000 4c8981c0000000 448981c8000000 }
$sequence_5hex{ 488b8c2428010000 e8???????? 4c8d842470180000 bae8030000 488d8c2480040000 e8???????? 33db }
$sequence_6hex{ 488d05fa930600 49894408f0 488b07 4c634004 458d48f0 45894c08ec 488d05de920600 }
$sequence_7hex{ 488b07 4c634004 488d05fa930600 49894408f0 488b07 4c634004 }
$sequence_8hex{ 722b 410fb609 41ffc0 83e10f 4a0fbe8431389a0600 428a8c31489a0600 4c2bc8 }
$sequence_9hex{ 4c896c2428 4c897c2420 e8???????? 84c0 0f8493feffff 4c8d25ed540200 49391f }

Condition

7 of them and filesize < 1129472

In plain words (Heuristic)

  • The file must be smaller than 1129472 (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: 296f5aee-ffa1-5f36-a21a-4cf73eb93c5f

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