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MALPEDIA_Win_Catb_Auto

autogenerated rule brought to you by yara-signator

MalwareCatbMalpedia 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: Catb.

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

Summary generated from the rule's metadata and condition.

Rule source

win-catb-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Catb_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "5f727573-f261-5578-8b83-74ab1ed31834"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.catb"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.catb_auto.yar#L1-L118"
		license_url = "N/A"
		logic_hash = "2f34f99c9516d4cefe1f06a36fd1a871f11ac79e7a0d20c0f60d54be32dad4b9"
		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 = { e9???????? 488d0543dd0300 4a8b04e8 42f644f83840 7405 }
		$sequence_1 = { 90 488d1db6a90300 488d3537fe0000 48895c2420 }
		$sequence_2 = { 488d159bdc0000 483950f0 740b 488b10 }
		$sequence_3 = { 428844f13e 4b8b84e0403e0400 42804cf03d04 38558f ebcc ff15???????? 894597 }
		$sequence_4 = { 0fb7c0 66f3ab 488d3d10130100 482bfe 8a041f 8803 }
		$sequence_5 = { eb16 b902000000 e8???????? 483bd8 757a 488d3df0d50300 ff05???????? }
		$sequence_6 = { 48ffcb ffc2 0fb603 4280bc087098010000 74e3 440fb603 }
		$sequence_7 = { 8bda 4c8d057e7e0000 488bf9 488d151c750000 }
		$sequence_8 = { 488bf8 4885c0 0f8483000000 41b812000000 488d1569550100 488bc8 ff15???????? }
		$sequence_9 = { 488bc3 498784f6803c0400 4885c0 7409 }

	condition:
		7 of them and filesize < 593920
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ e9???????? 488d0543dd0300 4a8b04e8 42f644f83840 7405 }
$sequence_1hex{ 90 488d1db6a90300 488d3537fe0000 48895c2420 }
$sequence_2hex{ 488d159bdc0000 483950f0 740b 488b10 }
$sequence_3hex{ 428844f13e 4b8b84e0403e0400 42804cf03d04 38558f ebcc ff15???????? 894597 }
$sequence_4hex{ 0fb7c0 66f3ab 488d3d10130100 482bfe 8a041f 8803 }
$sequence_5hex{ eb16 b902000000 e8???????? 483bd8 757a 488d3df0d50300 ff05???????? }
$sequence_6hex{ 48ffcb ffc2 0fb603 4280bc087098010000 74e3 440fb603 }
$sequence_7hex{ 8bda 4c8d057e7e0000 488bf9 488d151c750000 }
$sequence_8hex{ 488bf8 4885c0 0f8483000000 41b812000000 488d1569550100 488bc8 ff15???????? }
$sequence_9hex{ 488bc3 498784f6803c0400 4885c0 7409 }

Condition

7 of them and filesize < 593920

In plain words (Heuristic)

  • The file must be smaller than 593920 (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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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: 5f727573-f261-5578-8b83-74ab1ed31834

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