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MALPEDIA_Win_Sombrat_Auto

autogenerated rule brought to you by yara-signator

MalwareSombratMalpedia 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: Sombrat.

It defines 16 patterns (0 text, 16 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

win-sombrat-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Sombrat_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "af13e03f-a95f-5ae9-ab66-143e3efb1589"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.sombrat"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.sombrat_auto.yar#L1-L151"
		license_url = "N/A"
		logic_hash = "0df08af9c206a75a3da27570d60f8220a1618e070b3671a9b63afb191a74b380"
		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 = { 014114 8b7508 837df800 8b5df4 0f84c3feffff }
		$sequence_1 = { 834e4cff 66894650 8bc3 895620 }
		$sequence_2 = { 01041e 8b4508 42 8d7308 }
		$sequence_3 = { 0145e4 8b55f8 83c40c 294644 }
		$sequence_4 = { 014620 f6460c04 8945e0 742d 85c0 7429 8b4de4 }
		$sequence_5 = { 0000 e8???????? c70424???????? 8d5f0c 68???????? }
		$sequence_6 = { 014620 ff36 114e24 8b442434 }
		$sequence_7 = { 0144244a 894e0c ffb72c010000 ff15???????? }
		$sequence_8 = { 016b08 33c0 e9???????? 33ff }
		$sequence_9 = { 01448c20 48ffc1 493bc9 7cf1 }
		$sequence_10 = { 016b08 488d05dc980500 41b9e7160000 4889442420 }
		$sequence_11 = { 015f08 33c0 e9???????? 488b4760 }
		$sequence_12 = { 0145f1 4533c9 4533c0 488b16 }
		$sequence_13 = { 015f08 488bcf e8???????? 8bf0 }
		$sequence_14 = { 015f08 33c0 488b4c2470 4833cc }
		$sequence_15 = { 015f08 83bfd800000016 0f856c020000 488b87c8000000 }

	condition:
		7 of them and filesize < 1466368
}

Strings (16 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 014114 8b7508 837df800 8b5df4 0f84c3feffff }
$sequence_1hex{ 834e4cff 66894650 8bc3 895620 }
$sequence_2hex{ 01041e 8b4508 42 8d7308 }
$sequence_3hex{ 0145e4 8b55f8 83c40c 294644 }
$sequence_4hex{ 014620 f6460c04 8945e0 742d 85c0 7429 8b4de4 }
$sequence_5hex{ 0000 e8???????? c70424???????? 8d5f0c 68???????? }
$sequence_6hex{ 014620 ff36 114e24 8b442434 }
$sequence_7hex{ 0144244a 894e0c ffb72c010000 ff15???????? }
$sequence_8hex{ 016b08 33c0 e9???????? 33ff }
$sequence_9hex{ 01448c20 48ffc1 493bc9 7cf1 }
$sequence_10hex{ 016b08 488d05dc980500 41b9e7160000 4889442420 }
$sequence_11hex{ 015f08 33c0 e9???????? 488b4760 }
$sequence_12hex{ 0145f1 4533c9 4533c0 488b16 }
$sequence_13hex{ 015f08 488bcf e8???????? 8bf0 }
$sequence_14hex{ 015f08 33c0 488b4c2470 4833cc }
$sequence_15hex{ 015f08 83bfd800000016 0f856c020000 488b87c8000000 }

Condition

7 of them and filesize < 1466368

In plain words (Heuristic)

  • The file must be smaller than 1466368 (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: af13e03f-a95f-5ae9-ab66-143e3efb1589

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