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MALPEDIA_Win_Bleachgap_Auto

autogenerated rule brought to you by yara-signator

MalwareBleachgapMalpedia 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: Bleachgap.

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

Summary generated from the rule's metadata and condition.

Rule source

win-bleachgap-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Bleachgap_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "0b7104e7-d882-5b97-bb84-47dba5454a43"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.bleachgap"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.bleachgap_auto.yar#L1-L134"
		license_url = "N/A"
		logic_hash = "69e5613692d72f85c8f8f372fde97f28793e3e61fc475bd026973cd7cf7dca02"
		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 = { 33f6 894d08 85ff 7426 0f1f8000000000 8b01 8b5010 }
		$sequence_1 = { 83f810 7231 8b954cfeffff 8d4801 8bc2 81f900100000 7214 }
		$sequence_2 = { 894b28 f30f7e462c 660fd6432c 8b4e34 5f 5e 894b34 }
		$sequence_3 = { 83c404 85c0 78c6 74c1 56 895c2418 c7461401000000 }
		$sequence_4 = { 8b4c2448 83c40c 49 83f903 0f878f000000 ff248d28235000 53 }
		$sequence_5 = { 33c8 330c9508065f00 8b5734 33d9 33d6 33d5 33d3 }
		$sequence_6 = { 85c0 745e 8b477c 6878020000 68???????? 89b014020000 8b477c }
		$sequence_7 = { c1e804 6a02 0fb680d8675c00 8844241c 0fb681d8675c00 8844241d 8d44241c }
		$sequence_8 = { 85c0 7508 8986f84b6100 eb21 50 e8???????? 50 }
		$sequence_9 = { 85f6 0f8488020000 8b461c 56 6a00 c746602e000000 896e5c }

	condition:
		7 of them and filesize < 4538368
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 33f6 894d08 85ff 7426 0f1f8000000000 8b01 8b5010 }
$sequence_1hex{ 83f810 7231 8b954cfeffff 8d4801 8bc2 81f900100000 7214 }
$sequence_2hex{ 894b28 f30f7e462c 660fd6432c 8b4e34 5f 5e 894b34 }
$sequence_3hex{ 83c404 85c0 78c6 74c1 56 895c2418 c7461401000000 }
$sequence_4hex{ 8b4c2448 83c40c 49 83f903 0f878f000000 ff248d28235000 53 }
$sequence_5hex{ 33c8 330c9508065f00 8b5734 33d9 33d6 33d5 33d3 }
$sequence_6hex{ 85c0 745e 8b477c 6878020000 68???????? 89b014020000 8b477c }
$sequence_7hex{ c1e804 6a02 0fb680d8675c00 8844241c 0fb681d8675c00 8844241d 8d44241c }
$sequence_8hex{ 85c0 7508 8986f84b6100 eb21 50 e8???????? 50 }
$sequence_9hex{ 85f6 0f8488020000 8b461c 56 6a00 c746602e000000 896e5c }

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.

Test this rule in your browser

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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: 0b7104e7-d882-5b97-bb84-47dba5454a43

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