Skip to content

YARA · Malpedia signator rules

MALPEDIA_Win_Meduza_Auto

autogenerated rule brought to you by yara-signator

MalwareMeduzaMalpedia 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: Meduza.

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

Summary generated from the rule's metadata and condition.

Rule source

win-meduza-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Meduza_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "c0c15191-ded8-5ae0-8f8f-7ef94fb2eca1"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.meduza"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.meduza_auto.yar#L1-L133"
		license_url = "N/A"
		logic_hash = "55be562129c487f1236189f3c578422d39d422aaafeec055785306bea9b6404f"
		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 = { c785d8f6ffff0a6141f0 c785dcf6ffff216f18d1 8b85d8f6ffff 8b8ddcf6ffff 898530f1ffff 898d34f1ffff c785d8f6ffff76d35939 }
		$sequence_1 = { eb10 83ceff bbffffff7f 8975e4 eb03 8b75d8 8d4dc8 }
		$sequence_2 = { 898dfcfcffff 8d8da0f5ffff 8985f8fcffff 8d5101 660fef8df0fcffff 0f298da0f5ffff 0f1185d0ecffff }
		$sequence_3 = { c745b407000000 50 e8???????? 83c404 c78544ffffffc87a4a00 f30f7e00 8b4808 }
		$sequence_4 = { 898d4cd3ffff c785d8e4ffffcb46855e c785dce4ffffee6e1f36 8b85d8e4ffff 8b8ddce4ffff 898580eeffff 898d84eeffff }
		$sequence_5 = { 83c408 c645fc0d 837f1408 7202 8b3f 8b8544feffff }
		$sequence_6 = { e9???????? 8d8d50c7ffff e9???????? 8d8d50c7ffff e9???????? 8d8d80c7ffff e9???????? }
		$sequence_7 = { c785d8e4ffffdc70e11a c785dce4fffff74b9182 8b85d8e4ffff 8b8ddce4ffff 898568e9ffff c5fe6f85e0cdffff c5fdef8540e9ffff }
		$sequence_8 = { e9???????? 8d8dc0faffff e9???????? 8d8df0faffff e9???????? 8d8df0faffff e9???????? }
		$sequence_9 = { 23ce b801000000 d3e0 8b4dbc 8502 0f8499000000 e8???????? }

	condition:
		7 of them and filesize < 1433600
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ c785d8f6ffff0a6141f0 c785dcf6ffff216f18d1 8b85d8f6ffff 8b8ddcf6ffff 898530f1ffff 898d34f1ffff c785d8f6ffff76d35939 }
$sequence_1hex{ eb10 83ceff bbffffff7f 8975e4 eb03 8b75d8 8d4dc8 }
$sequence_2hex{ 898dfcfcffff 8d8da0f5ffff 8985f8fcffff 8d5101 660fef8df0fcffff 0f298da0f5ffff 0f1185d0ecffff }
$sequence_3hex{ c745b407000000 50 e8???????? 83c404 c78544ffffffc87a4a00 f30f7e00 8b4808 }
$sequence_4hex{ 898d4cd3ffff c785d8e4ffffcb46855e c785dce4ffffee6e1f36 8b85d8e4ffff 8b8ddce4ffff 898580eeffff 898d84eeffff }
$sequence_5hex{ 83c408 c645fc0d 837f1408 7202 8b3f 8b8544feffff }
$sequence_6hex{ e9???????? 8d8d50c7ffff e9???????? 8d8d50c7ffff e9???????? 8d8d80c7ffff e9???????? }
$sequence_7hex{ c785d8e4ffffdc70e11a c785dce4fffff74b9182 8b85d8e4ffff 8b8ddce4ffff 898568e9ffff c5fe6f85e0cdffff c5fdef8540e9ffff }
$sequence_8hex{ e9???????? 8d8dc0faffff e9???????? 8d8df0faffff e9???????? 8d8df0faffff e9???????? }
$sequence_9hex{ 23ce b801000000 d3e0 8b4dbc 8502 0f8499000000 e8???????? }

Condition

7 of them and filesize < 1433600

In plain words (Heuristic)

  • The file must be smaller than 1433600 (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: c0c15191-ded8-5ae0-8f8f-7ef94fb2eca1

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