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MALPEDIA_Win_Lowball_Auto

autogenerated rule brought to you by yara-signator

MalwareLowballMalpedia 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: Lowball.

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

Summary generated from the rule's metadata and condition.

Rule source

win-lowball-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Lowball_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "97a18ac2-485c-507c-8ccf-e6257898d15d"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.lowball"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.lowball_auto.yar#L1-L118"
		license_url = "N/A"
		logic_hash = "f0cfaf3c86d2a26a3fc0cf781b4702870c4026afd625423d383fbc1a5ca3d73e"
		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 = { 8bfa 8d94244c0d0000 c1e902 f3a5 8bc8 }
		$sequence_1 = { 81ec14020000 a0???????? 55 56 57 88442420 b97f000000 }
		$sequence_2 = { 0f848c000000 8b942420020000 55 6a00 }
		$sequence_3 = { f3ab aa 83c9ff bf???????? }
		$sequence_4 = { 57 ff15???????? 8be8 85ed 7459 }
		$sequence_5 = { 85f6 7e13 8a4c2410 53 8a1c10 32d9 881c10 }
		$sequence_6 = { 85f6 89742410 0f84bf000000 8b8c241c020000 }
		$sequence_7 = { ff15???????? 83c408 be???????? 8bc5 8a10 8a1e }
		$sequence_8 = { 8b942428060000 55 6a00 6800058084 6a00 6a00 68???????? }
		$sequence_9 = { f7d1 49 8be9 8b842434020000 68???????? }

	condition:
		7 of them and filesize < 40960
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 8bfa 8d94244c0d0000 c1e902 f3a5 8bc8 }
$sequence_1hex{ 81ec14020000 a0???????? 55 56 57 88442420 b97f000000 }
$sequence_2hex{ 0f848c000000 8b942420020000 55 6a00 }
$sequence_3hex{ f3ab aa 83c9ff bf???????? }
$sequence_4hex{ 57 ff15???????? 8be8 85ed 7459 }
$sequence_5hex{ 85f6 7e13 8a4c2410 53 8a1c10 32d9 881c10 }
$sequence_6hex{ 85f6 89742410 0f84bf000000 8b8c241c020000 }
$sequence_7hex{ ff15???????? 83c408 be???????? 8bc5 8a10 8a1e }
$sequence_8hex{ 8b942428060000 55 6a00 6800058084 6a00 6a00 68???????? }
$sequence_9hex{ f7d1 49 8be9 8b842434020000 68???????? }

Condition

7 of them and filesize < 40960

In plain words (Heuristic)

  • The file must be smaller than 40960 (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: 97a18ac2-485c-507c-8ccf-e6257898d15d

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