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MALPEDIA_Win_Bistromath_Auto

autogenerated rule brought to you by yara-signator

MalwareBistromathMalpedia 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: Bistromath.

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

Summary generated from the rule's metadata and condition.

Rule source

win-bistromath-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Bistromath_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "54ad0f84-d78e-5bd9-a40d-420d01711b9f"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.bistromath"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.bistromath_auto.yar#L1-L134"
		license_url = "N/A"
		logic_hash = "7615d632c66a152a6e4c104983d7e764f9e263d21223a9467ecf49dd7ed61bf0"
		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 = { eb4c 8b4de8 33c0 8bd7 66894314 e8???????? 85c0 }
		$sequence_1 = { e8???????? 2500030000 c3 8bff 55 8bec 668b4d0e }
		$sequence_2 = { eb03 8b5dc4 8b5508 83c730 3b7de4 0f8200ffffff 33ff }
		$sequence_3 = { e8???????? 3b450c 7430 8bcf e8???????? 8903 85c0 }
		$sequence_4 = { eb16 84db 7406 02c3 3c62 75db 8b4d0c }
		$sequence_5 = { ffd0 83c414 85c0 0f850f010000 8b4df4 8b5340 83c104 }
		$sequence_6 = { eb0b 85f6 0f85c9000000 8b4508 8d34dd01000000 8bc8 8bd6 }
		$sequence_7 = { ff742424 e8???????? 83c410 8b442418 c6401101 8b442440 ff4018 }
		$sequence_8 = { eb09 ff7708 50 68???????? 50 53 e8???????? }
		$sequence_9 = { 8bec 83ec20 803900 7506 33c0 8be5 5d }

	condition:
		7 of them and filesize < 33816576
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ eb4c 8b4de8 33c0 8bd7 66894314 e8???????? 85c0 }
$sequence_1hex{ e8???????? 2500030000 c3 8bff 55 8bec 668b4d0e }
$sequence_2hex{ eb03 8b5dc4 8b5508 83c730 3b7de4 0f8200ffffff 33ff }
$sequence_3hex{ e8???????? 3b450c 7430 8bcf e8???????? 8903 85c0 }
$sequence_4hex{ eb16 84db 7406 02c3 3c62 75db 8b4d0c }
$sequence_5hex{ ffd0 83c414 85c0 0f850f010000 8b4df4 8b5340 83c104 }
$sequence_6hex{ eb0b 85f6 0f85c9000000 8b4508 8d34dd01000000 8bc8 8bd6 }
$sequence_7hex{ ff742424 e8???????? 83c410 8b442418 c6401101 8b442440 ff4018 }
$sequence_8hex{ eb09 ff7708 50 68???????? 50 53 e8???????? }
$sequence_9hex{ 8bec 83ec20 803900 7506 33c0 8be5 5d }

Condition

7 of them and filesize < 33816576

In plain words (Heuristic)

  • The file must be smaller than 33816576 (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: 54ad0f84-d78e-5bd9-a40d-420d01711b9f

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