Skip to content

YARA · Malpedia signator rules

MALPEDIA_Win_Chewbacca_Auto

autogenerated rule brought to you by yara-signator

MalwareChewbaccaMalpedia 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: Chewbacca.

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

Summary generated from the rule's metadata and condition.

Rule source

win-chewbacca-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Chewbacca_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "540af0df-c476-50dc-baf1-115807795d55"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.chewbacca"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.chewbacca_auto.yar#L1-L134"
		license_url = "N/A"
		logic_hash = "742822157bec8dd9ee72aed765221c6cf83fa642a836fe167c2ac418ecc29121"
		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 = { e8???????? eb55 8b442478 89442414 895c2410 c744240c9c976600 c7442408???????? }
		$sequence_1 = { ff33 74fd 0389cfc1ef10 81e7ff000000 3374fd02 89d7 c1ef18 }
		$sequence_2 = { e8???????? c744241426a36700 c744241048cf6700 c744240c20060000 89442408 c7442404???????? a1???????? }
		$sequence_3 = { a3???????? 8b442424 89442408 8b442420 89442404 a1???????? 890424 }
		$sequence_4 = { c7042424040000 e8???????? 89c2 85c0 0f84a0000000 89c7 be24040000 }
		$sequence_5 = { e8???????? c7042401000000 e8???????? e8???????? 89c3 e8???????? 895c2410 }
		$sequence_6 = { eb0c be00000000 eb05 be00000000 89f0 83c410 5b }
		$sequence_7 = { f2ae f7d1 8b442440 8d4408ff 89442440 e9???????? 89e8 }
		$sequence_8 = { 8945fc 89d3 89ce 8a4508 84c0 7409 8b45fc }
		$sequence_9 = { 8b542454 8b442450 e8???????? 85c0 740b 83c43c 5b }

	condition:
		7 of them and filesize < 9764864
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ e8???????? eb55 8b442478 89442414 895c2410 c744240c9c976600 c7442408???????? }
$sequence_1hex{ ff33 74fd 0389cfc1ef10 81e7ff000000 3374fd02 89d7 c1ef18 }
$sequence_2hex{ e8???????? c744241426a36700 c744241048cf6700 c744240c20060000 89442408 c7442404???????? a1???????? }
$sequence_3hex{ a3???????? 8b442424 89442408 8b442420 89442404 a1???????? 890424 }
$sequence_4hex{ c7042424040000 e8???????? 89c2 85c0 0f84a0000000 89c7 be24040000 }
$sequence_5hex{ e8???????? c7042401000000 e8???????? e8???????? 89c3 e8???????? 895c2410 }
$sequence_6hex{ eb0c be00000000 eb05 be00000000 89f0 83c410 5b }
$sequence_7hex{ f2ae f7d1 8b442440 8d4408ff 89442440 e9???????? 89e8 }
$sequence_8hex{ 8945fc 89d3 89ce 8a4508 84c0 7409 8b45fc }
$sequence_9hex{ 8b542454 8b442450 e8???????? 85c0 740b 83c43c 5b }

Condition

7 of them and filesize < 9764864

In plain words (Heuristic)

  • The file must be smaller than 9764864 (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: 540af0df-c476-50dc-baf1-115807795d55

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