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MALPEDIA_Win_Bid_Ransomware_Auto

autogenerated rule brought to you by yara-signator

MalwareBid RansomwareMalpedia 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: Bid Ransomware.

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

Summary generated from the rule's metadata and condition.

Rule source

win-bid-ransomware-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Bid_Ransomware_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "ce47ce7f-14e1-59ae-ba57-79394ad6dc42"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.bid_ransomware"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.bid_ransomware_auto.yar#L1-L127"
		license_url = "N/A"
		logic_hash = "f1877b67a4049109e0b2de66aad3ce4469b6223b173e84f5ebaf276fe703ce2d"
		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 = { 8d45a4 50 6a00 6a00 68???????? 6a00 }
		$sequence_1 = { 68???????? e8???????? 85c0 0f848d000000 8b7508 ff7508 }
		$sequence_2 = { e8???????? 60 6a00 6a02 e8???????? 8bd8 c785d4fdffff2c020000 }
		$sequence_3 = { e8???????? c9 c3 55 8bec 60 }
		$sequence_4 = { e8???????? 83f800 7605 8945f4 eb02 ebc9 }
		$sequence_5 = { ff759c e8???????? 8b45a8 0500040000 894590 6800010000 }
		$sequence_6 = { 6a00 6a00 e8???????? 6a0f 50 }
		$sequence_7 = { ff75f4 e8???????? ff75fc e8???????? ff05???????? ff75e4 e8???????? }
		$sequence_8 = { e8???????? 8d85d4fdffff 50 53 e8???????? ebb4 53 }
		$sequence_9 = { 6a00 8d00 50 e8???????? eb79 8b5814 66813b5c5c }

	condition:
		7 of them and filesize < 57344
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 8d45a4 50 6a00 6a00 68???????? 6a00 }
$sequence_1hex{ 68???????? e8???????? 85c0 0f848d000000 8b7508 ff7508 }
$sequence_2hex{ e8???????? 60 6a00 6a02 e8???????? 8bd8 c785d4fdffff2c020000 }
$sequence_3hex{ e8???????? c9 c3 55 8bec 60 }
$sequence_4hex{ e8???????? 83f800 7605 8945f4 eb02 ebc9 }
$sequence_5hex{ ff759c e8???????? 8b45a8 0500040000 894590 6800010000 }
$sequence_6hex{ 6a00 6a00 e8???????? 6a0f 50 }
$sequence_7hex{ ff75f4 e8???????? ff75fc e8???????? ff05???????? ff75e4 e8???????? }
$sequence_8hex{ e8???????? 8d85d4fdffff 50 53 e8???????? ebb4 53 }
$sequence_9hex{ 6a00 8d00 50 e8???????? eb79 8b5814 66813b5c5c }

Condition

7 of them and filesize < 57344

In plain words (Heuristic)

  • The file must be smaller than 57344 (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: ce47ce7f-14e1-59ae-ba57-79394ad6dc42

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