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MALPEDIA_Win_Chthonic_Auto

autogenerated rule brought to you by yara-signator

MalwareChthonicMalpedia 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: Chthonic.

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

Summary generated from the rule's metadata and condition.

Rule source

win-chthonic-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Chthonic_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "8b64add5-ff03-5fa0-9d49-9279e42d139e"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.chthonic"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.chthonic_auto.yar#L1-L121"
		license_url = "N/A"
		logic_hash = "868310f060146371dd87c106e4ad6857182f77f3854b6b725bec1227384a4b4b"
		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 = { 5f c1ee1f e9???????? 8b041a 8bc8 83c204 }
		$sequence_1 = { 53 ff7510 ff7508 e8???????? 85c0 7502 b301 }
		$sequence_2 = { 3bc3 7cf4 33f6 33d2 8bc6 f77514 }
		$sequence_3 = { 81e1ff00ff00 0bc1 89470c 5f }
		$sequence_4 = { 894dfc 85ff 7459 4f 8bf0 }
		$sequence_5 = { ff45f4 ff4dfc 75ec 894df4 e9???????? 8b041a }
		$sequence_6 = { c1c108 81e1ff00ff00 0bc1 89470c }
		$sequence_7 = { eb00 85ff 0f84bd000000 4f 8bf0 }
		$sequence_8 = { 83fe02 0f850d010000 8b4df0 eb00 894df8 85ff 0f84e7000000 }
		$sequence_9 = { ff751c ff7518 ff7514 53 ff7510 ff7508 e8???????? }

	condition:
		7 of them and filesize < 425984
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 5f c1ee1f e9???????? 8b041a 8bc8 83c204 }
$sequence_1hex{ 53 ff7510 ff7508 e8???????? 85c0 7502 b301 }
$sequence_2hex{ 3bc3 7cf4 33f6 33d2 8bc6 f77514 }
$sequence_3hex{ 81e1ff00ff00 0bc1 89470c 5f }
$sequence_4hex{ 894dfc 85ff 7459 4f 8bf0 }
$sequence_5hex{ ff45f4 ff4dfc 75ec 894df4 e9???????? 8b041a }
$sequence_6hex{ c1c108 81e1ff00ff00 0bc1 89470c }
$sequence_7hex{ eb00 85ff 0f84bd000000 4f 8bf0 }
$sequence_8hex{ 83fe02 0f850d010000 8b4df0 eb00 894df8 85ff 0f84e7000000 }
$sequence_9hex{ ff751c ff7518 ff7514 53 ff7510 ff7508 e8???????? }

Condition

7 of them and filesize < 425984

In plain words (Heuristic)

  • The file must be smaller than 425984 (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: 8b64add5-ff03-5fa0-9d49-9279e42d139e

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