Skip to content

YARA · Malpedia signator rules

MALPEDIA_Win_Catchamas_Auto

autogenerated rule brought to you by yara-signator

MalwareCatchamasMalpedia 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: Catchamas.

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

Summary generated from the rule's metadata and condition.

Rule source

win-catchamas-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Catchamas_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "1fbc664f-7a9f-5552-8d5c-95e60000007c"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.catchamas"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.catchamas_auto.yar#L1-L121"
		license_url = "N/A"
		logic_hash = "473e7570bef3a332b187682077d82fa33e5227101da479d784c3662da74732c2"
		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 = { baba000000 663bf2 720a bac0000000 663bf2 }
		$sequence_1 = { 68???????? 56 e8???????? 8bd8 8d045e }
		$sequence_2 = { 0f8207ffffff 8b44242c 8b35???????? 8b3d???????? 8b1d???????? 8b2d???????? 8d542430 }
		$sequence_3 = { 7d0a 6857000780 e8???????? 8b442408 8b00 53 55 }
		$sequence_4 = { 50 889c2434060000 e8???????? 83c40c 6808080000 8d8c242c060000 51 }
		$sequence_5 = { 50 6a00 ff15???????? 8d8424c8000000 48 8a4801 40 }
		$sequence_6 = { 8b6c2414 56 57 6830040000 }
		$sequence_7 = { be???????? f3a5 bf???????? 4f 8a4701 }
		$sequence_8 = { c3 8d44240c 8bd0 2bf2 8a08 880c06 }
		$sequence_9 = { ff15???????? 83c42c eb24 8b4c2418 }

	condition:
		7 of them and filesize < 368640
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ baba000000 663bf2 720a bac0000000 663bf2 }
$sequence_1hex{ 68???????? 56 e8???????? 8bd8 8d045e }
$sequence_2hex{ 0f8207ffffff 8b44242c 8b35???????? 8b3d???????? 8b1d???????? 8b2d???????? 8d542430 }
$sequence_3hex{ 7d0a 6857000780 e8???????? 8b442408 8b00 53 55 }
$sequence_4hex{ 50 889c2434060000 e8???????? 83c40c 6808080000 8d8c242c060000 51 }
$sequence_5hex{ 50 6a00 ff15???????? 8d8424c8000000 48 8a4801 40 }
$sequence_6hex{ 8b6c2414 56 57 6830040000 }
$sequence_7hex{ be???????? f3a5 bf???????? 4f 8a4701 }
$sequence_8hex{ c3 8d44240c 8bd0 2bf2 8a08 880c06 }
$sequence_9hex{ ff15???????? 83c42c eb24 8b4c2418 }

Condition

7 of them and filesize < 368640

In plain words (Heuristic)

  • The file must be smaller than 368640 (a cheap guard that skips large files).
  • At least 7 patterns in the rule must match.

Test this rule in your browser

Drop a file to scan it with this rule using YARA-X compiled to WebAssembly. Nothing is uploaded.

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: 1fbc664f-7a9f-5552-8d5c-95e60000007c

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