Skip to content

YARA · Malpedia signator rules

MALPEDIA_Win_Molerat_Loader_Auto

autogenerated rule brought to you by yara-signator

MalwareMolerat LoaderMalpedia 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: Molerat Loader.

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

Summary generated from the rule's metadata and condition.

Rule source

win-molerat-loader-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Molerat_Loader_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "dd34e6fe-166f-5992-ad77-da2eef3e6cc0"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.molerat_loader"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.molerat_loader_auto.yar#L1-L122"
		license_url = "N/A"
		logic_hash = "5fb2e2aad10aacaac4a058eda16abe79ff96d35c84f0d7b23df476065493d644"
		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 = { 50 c645fc83 e8???????? 83c40c c645fc84 }
		$sequence_1 = { e9???????? 81bd5cfeffff68494400 742d 8b4508 83c005 }
		$sequence_2 = { 8b08 8b11 50 8b4204 ffd0 c644243409 8b44240c }
		$sequence_3 = { 8d9b00000000 8b13 8b5234 68cf070000 8d4500 50 }
		$sequence_4 = { ebb4 8ad3 80c240 80fa1f 77f0 83c701 }
		$sequence_5 = { 7d10 668b4c4310 66890c456c7e4400 40 ebe8 33c0 8945e4 }
		$sequence_6 = { c645fc21 8b8568feffff 83c0f0 8d480c 83caff f00fc111 4a }
		$sequence_7 = { 83c408 84c0 0f8430060000 51 }
		$sequence_8 = { 8bcb e8???????? c645fc3e 8b45e8 }
		$sequence_9 = { 83c110 890b eb0c 8b48f4 51 50 8bcb }

	condition:
		7 of them and filesize < 688128
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 50 c645fc83 e8???????? 83c40c c645fc84 }
$sequence_1hex{ e9???????? 81bd5cfeffff68494400 742d 8b4508 83c005 }
$sequence_2hex{ 8b08 8b11 50 8b4204 ffd0 c644243409 8b44240c }
$sequence_3hex{ 8d9b00000000 8b13 8b5234 68cf070000 8d4500 50 }
$sequence_4hex{ ebb4 8ad3 80c240 80fa1f 77f0 83c701 }
$sequence_5hex{ 7d10 668b4c4310 66890c456c7e4400 40 ebe8 33c0 8945e4 }
$sequence_6hex{ c645fc21 8b8568feffff 83c0f0 8d480c 83caff f00fc111 4a }
$sequence_7hex{ 83c408 84c0 0f8430060000 51 }
$sequence_8hex{ 8bcb e8???????? c645fc3e 8b45e8 }
$sequence_9hex{ 83c110 890b eb0c 8b48f4 51 50 8bcb }

Condition

7 of them and filesize < 688128

In plain words (Heuristic)

  • The file must be smaller than 688128 (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: dd34e6fe-166f-5992-ad77-da2eef3e6cc0

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