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MALPEDIA_Win_Sepsys_Auto

autogenerated rule brought to you by yara-signator

MalwareSepsysMalpedia 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: Sepsys.

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

Summary generated from the rule's metadata and condition.

Rule source

win-sepsys-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Sepsys_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "c12c3537-3fd8-5ecf-8dd9-67f4624ff20f"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.sepsys"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.sepsys_auto.yar#L1-L134"
		license_url = "N/A"
		logic_hash = "a2b2408899bb537ebfeb6b18425a18b6df17445171aaa35588bfa6271032b916"
		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 = { eb43 488b442430 488b4c2470 488908 488b442430 8b4c2478 894808 }
		$sequence_1 = { c744244000000800 eb23 837c244001 7d0a c744244000400000 eb12 817c244000040000 }
		$sequence_2 = { c645f701 488b4110 488945e0 0f1001 0f2945d0 488b4dc8 e8???????? }
		$sequence_3 = { e8???????? 89442420 837c242000 7406 8b442420 eb0c eb08 }
		$sequence_4 = { eb00 e8???????? 8845e0 eb00 488b45f8 8a4def 8808 }
		$sequence_5 = { e8???????? 4889942418010000 4889842410010000 488b842410010000 4885c0 0f95c1 0fb6d1 }
		$sequence_6 = { e8???????? eb54 48837c246000 7421 488b442460 488b8c2488000000 48894828 }
		$sequence_7 = { e8???????? 488945b8 eb00 488b4db8 e8???????? 488945b0 eb00 }
		$sequence_8 = { 8b442420 25ff000000 8bc8 e8???????? b901000000 486bc902 488b542460 }
		$sequence_9 = { eb08 c744246401000000 0fb6442464 88442420 0fb6442420 85c0 7415 }

	condition:
		7 of them and filesize < 4538368
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ eb43 488b442430 488b4c2470 488908 488b442430 8b4c2478 894808 }
$sequence_1hex{ c744244000000800 eb23 837c244001 7d0a c744244000400000 eb12 817c244000040000 }
$sequence_2hex{ c645f701 488b4110 488945e0 0f1001 0f2945d0 488b4dc8 e8???????? }
$sequence_3hex{ e8???????? 89442420 837c242000 7406 8b442420 eb0c eb08 }
$sequence_4hex{ eb00 e8???????? 8845e0 eb00 488b45f8 8a4def 8808 }
$sequence_5hex{ e8???????? 4889942418010000 4889842410010000 488b842410010000 4885c0 0f95c1 0fb6d1 }
$sequence_6hex{ e8???????? eb54 48837c246000 7421 488b442460 488b8c2488000000 48894828 }
$sequence_7hex{ e8???????? 488945b8 eb00 488b4db8 e8???????? 488945b0 eb00 }
$sequence_8hex{ 8b442420 25ff000000 8bc8 e8???????? b901000000 486bc902 488b542460 }
$sequence_9hex{ eb08 c744246401000000 0fb6442464 88442420 0fb6442420 85c0 7415 }

Condition

7 of them and filesize < 4538368

In plain words (Heuristic)

  • The file must be smaller than 4538368 (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: c12c3537-3fd8-5ecf-8dd9-67f4624ff20f

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