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MALPEDIA_Win_Koadic_Auto

autogenerated rule brought to you by yara-signator

MalwareKoadicMalpedia 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: Koadic.

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

Summary generated from the rule's metadata and condition.

Rule source

win-koadic-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Koadic_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "bf88d4a7-0ac8-5d5f-97c3-f273f6977c73"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.koadic"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.koadic_auto.yar#L1-L126"
		license_url = "N/A"
		logic_hash = "9196b0f87e82e86efe9c0d9c680f1d92780e7fd08cea995d1ee35ec7725abb9e"
		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 = { 011424 ff35???????? e8???????? 89c5 c7450001000000 ff35???????? }
		$sequence_1 = { 8d442424 50 e8???????? eb0f 8d4c2418 }
		$sequence_2 = { 6810000000 ff35???????? e8???????? 68???????? e8???????? 8b15???????? }
		$sequence_3 = { ff3424 e8???????? 8b1424 ff35???????? e8???????? 58 }
		$sequence_4 = { 8b4c241c 894f04 885d30 5f 5e 5b }
		$sequence_5 = { 50 e8???????? eb29 6a08 51 845c2420 7411 }
		$sequence_6 = { ff7500 58 a3???????? 8b6c240c ff7500 58 a3???????? }
		$sequence_7 = { 83feff 0f8580fdffff 8bc8 8b450c 5e 3bc8 7d1d }
		$sequence_8 = { 8b4614 55 8b6c241c 57 8b3d???????? }
		$sequence_9 = { e8???????? ff35???????? e8???????? 8d442410 50 e8???????? ff35???????? }

	condition:
		7 of them and filesize < 180224
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 011424 ff35???????? e8???????? 89c5 c7450001000000 ff35???????? }
$sequence_1hex{ 8d442424 50 e8???????? eb0f 8d4c2418 }
$sequence_2hex{ 6810000000 ff35???????? e8???????? 68???????? e8???????? 8b15???????? }
$sequence_3hex{ ff3424 e8???????? 8b1424 ff35???????? e8???????? 58 }
$sequence_4hex{ 8b4c241c 894f04 885d30 5f 5e 5b }
$sequence_5hex{ 50 e8???????? eb29 6a08 51 845c2420 7411 }
$sequence_6hex{ ff7500 58 a3???????? 8b6c240c ff7500 58 a3???????? }
$sequence_7hex{ 83feff 0f8580fdffff 8bc8 8b450c 5e 3bc8 7d1d }
$sequence_8hex{ 8b4614 55 8b6c241c 57 8b3d???????? }
$sequence_9hex{ e8???????? ff35???????? e8???????? 8d442410 50 e8???????? ff35???????? }

Condition

7 of them and filesize < 180224

In plain words (Heuristic)

  • The file must be smaller than 180224 (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: bf88d4a7-0ac8-5d5f-97c3-f273f6977c73

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