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MALPEDIA_Win_Bitsran_Auto

autogenerated rule brought to you by yara-signator

MalwareBitsranMalpedia 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: Bitsran.

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

Summary generated from the rule's metadata and condition.

Rule source

win-bitsran-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Bitsran_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "16c55ef7-ea38-5a6e-9b03-3ffbc1490773"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.bitsran"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.bitsran_auto.yar#L1-L126"
		license_url = "N/A"
		logic_hash = "66ad634ce1f4bbbfe736e731a2362905372751f8a16d7a77b20768e031217360"
		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 = { 740a 8b85f4feffff 56 50 eb3a 8b0d???????? 8b15???????? }
		$sequence_1 = { 8bbdf4feffff 8d4701 50 e8???????? 57 }
		$sequence_2 = { 85c0 7403 8975fc 837dfc00 }
		$sequence_3 = { e8???????? 8be5 5d c3 57 8bff 33c9 }
		$sequence_4 = { c1f905 8b0c8da01f4200 83e21f c1e206 385c1104 7506 4e }
		$sequence_5 = { 7509 c743186c5d4100 eb11 83fefc 740c c743184c5d4100 }
		$sequence_6 = { 66894ddc ff15???????? 83f801 753b 8b4d0c 8b55f0 69c9e8030000 }
		$sequence_7 = { 83c408 85c0 7403 8975fc 8b03 8d55cc 52 }
		$sequence_8 = { 8bc1 c1f805 8bf1 83e61f 8d3c85a01f4200 }
		$sequence_9 = { 8935???????? ff15???????? 50 e8???????? 8bf7 2bf3 c1fe02 }

	condition:
		7 of them and filesize < 344064
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 740a 8b85f4feffff 56 50 eb3a 8b0d???????? 8b15???????? }
$sequence_1hex{ 8bbdf4feffff 8d4701 50 e8???????? 57 }
$sequence_2hex{ 85c0 7403 8975fc 837dfc00 }
$sequence_3hex{ e8???????? 8be5 5d c3 57 8bff 33c9 }
$sequence_4hex{ c1f905 8b0c8da01f4200 83e21f c1e206 385c1104 7506 4e }
$sequence_5hex{ 7509 c743186c5d4100 eb11 83fefc 740c c743184c5d4100 }
$sequence_6hex{ 66894ddc ff15???????? 83f801 753b 8b4d0c 8b55f0 69c9e8030000 }
$sequence_7hex{ 83c408 85c0 7403 8975fc 8b03 8d55cc 52 }
$sequence_8hex{ 8bc1 c1f805 8bf1 83e61f 8d3c85a01f4200 }
$sequence_9hex{ 8935???????? ff15???????? 50 e8???????? 8bf7 2bf3 c1fe02 }

Condition

7 of them and filesize < 344064

In plain words (Heuristic)

  • The file must be smaller than 344064 (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: 16c55ef7-ea38-5a6e-9b03-3ffbc1490773

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