Skip to content

YARA · Malpedia signator rules

MALPEDIA_Win_Felismus_Auto

autogenerated rule brought to you by yara-signator

MalwareFelismusMalpedia 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: Felismus.

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

Summary generated from the rule's metadata and condition.

Rule source

win-felismus-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Felismus_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "3f2c0e26-c37d-557f-9ad8-75051e096f9d"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.felismus"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.felismus_auto.yar#L1-L129"
		license_url = "N/A"
		logic_hash = "893bdfe24db443bd54242bf3384297b8c01720bb5dff66426f96a589ffe0666d"
		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 = { d3eb 8b0d???????? d3e0 8bce f7d1 0bd8 8b442428 }
		$sequence_1 = { d3e6 8b482c 894c243c 0bd6 8bf3 03d3 }
		$sequence_2 = { 89542410 8b5110 56 2be8 57 89542420 bb01000000 }
		$sequence_3 = { 46 83fe04 88040a 7ceb 43 83c704 83fb04 }
		$sequence_4 = { e8???????? 83c444 6a32 e8???????? 8bf8 8b4514 }
		$sequence_5 = { 33c0 8bfb 895de4 f3ab eb06 8b5de4 8b7508 }
		$sequence_6 = { 83e802 7469 48 7442 48 741b 8d942450040000 }
		$sequence_7 = { 56 ffd3 83c40c eb06 8b1d???????? 6804010000 e8???????? }
		$sequence_8 = { 6801040000 ff15???????? 8be8 83c404 }
		$sequence_9 = { 55 53 ff15???????? 85c0 0f848e010000 6801040000 ff15???????? }

	condition:
		7 of them and filesize < 204800
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ d3eb 8b0d???????? d3e0 8bce f7d1 0bd8 8b442428 }
$sequence_1hex{ d3e6 8b482c 894c243c 0bd6 8bf3 03d3 }
$sequence_2hex{ 89542410 8b5110 56 2be8 57 89542420 bb01000000 }
$sequence_3hex{ 46 83fe04 88040a 7ceb 43 83c704 83fb04 }
$sequence_4hex{ e8???????? 83c444 6a32 e8???????? 8bf8 8b4514 }
$sequence_5hex{ 33c0 8bfb 895de4 f3ab eb06 8b5de4 8b7508 }
$sequence_6hex{ 83e802 7469 48 7442 48 741b 8d942450040000 }
$sequence_7hex{ 56 ffd3 83c40c eb06 8b1d???????? 6804010000 e8???????? }
$sequence_8hex{ 6801040000 ff15???????? 8be8 83c404 }
$sequence_9hex{ 55 53 ff15???????? 85c0 0f848e010000 6801040000 ff15???????? }

Condition

7 of them and filesize < 204800

In plain words (Heuristic)

  • The file must be smaller than 204800 (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: 3f2c0e26-c37d-557f-9ad8-75051e096f9d

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