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MALPEDIA_Win_Bs2005_Auto

autogenerated rule brought to you by yara-signator

MalwareBs2005Malpedia 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: Bs2005.

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

Summary generated from the rule's metadata and condition.

Rule source

win-bs2005-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Bs2005_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "c4befd31-9531-5de2-aa5e-ea082e375341"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.bs2005"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.bs2005_auto.yar#L1-L121"
		license_url = "N/A"
		logic_hash = "190262bb63093685e83b8f09df7185445a30ae67220a772f1f0045c2ececafe5"
		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 = { 53 68???????? 57 ff15???????? 8bc7 83c418 8d4801 }
		$sequence_1 = { 5d c3 8d5a9f 80fb19 771c 0fbeca }
		$sequence_2 = { 898844000400 8b974c060000 8b02 c6404037 8b8f54060000 }
		$sequence_3 = { 52 6a04 50 8945e4 8b45e8 68???????? 50 }
		$sequence_4 = { 40 84c9 75f9 8b8f4c060000 2bc2 }
		$sequence_5 = { 52 e8???????? 8b4dfc 83c40c 50 }
		$sequence_6 = { c1f918 884cb5ec 8bd0 8bc8 c1fa10 c1f908 8854b5ed }
		$sequence_7 = { ffd2 8b06 8b08 8b5108 }
		$sequence_8 = { e8???????? 8d8f14010000 8bc1 83c40c 8d7001 8bff 8a10 }
		$sequence_9 = { 85c0 749c 8b55cc 52 }

	condition:
		7 of them and filesize < 212992
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 53 68???????? 57 ff15???????? 8bc7 83c418 8d4801 }
$sequence_1hex{ 5d c3 8d5a9f 80fb19 771c 0fbeca }
$sequence_2hex{ 898844000400 8b974c060000 8b02 c6404037 8b8f54060000 }
$sequence_3hex{ 52 6a04 50 8945e4 8b45e8 68???????? 50 }
$sequence_4hex{ 40 84c9 75f9 8b8f4c060000 2bc2 }
$sequence_5hex{ 52 e8???????? 8b4dfc 83c40c 50 }
$sequence_6hex{ c1f918 884cb5ec 8bd0 8bc8 c1fa10 c1f908 8854b5ed }
$sequence_7hex{ ffd2 8b06 8b08 8b5108 }
$sequence_8hex{ e8???????? 8d8f14010000 8bc1 83c40c 8d7001 8bff 8a10 }
$sequence_9hex{ 85c0 749c 8b55cc 52 }

Condition

7 of them and filesize < 212992

In plain words (Heuristic)

  • The file must be smaller than 212992 (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: c4befd31-9531-5de2-aa5e-ea082e375341

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