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MALPEDIA_Win_Romcom_Rat_Auto

autogenerated rule brought to you by yara-signator

MalwareRomcom RatMalpedia 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: Romcom Rat.

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

Summary generated from the rule's metadata and condition.

Rule source

win-romcom-rat-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Romcom_Rat_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "3df8a6c8-8cad-530b-8fa5-c51892c15404"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.romcom_rat"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.romcom_rat_auto.yar#L1-L132"
		license_url = "N/A"
		logic_hash = "329446130971e3e9d98f830b9af67bc4ad5f748c380e9572e174475f4a618fbe"
		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 = { 4c8bf2 4d8903 488907 4d8b13 4d3bd1 0f84ec000000 483b442440 }
		$sequence_1 = { 83f801 0f8440ffffff 488b8da0020000 4833cc e8???????? 4c8d9c24b0030000 498b5b38 }
		$sequence_2 = { 48895c2408 57 4883ec20 488bd9 488d05341b0600 488901 }
		$sequence_3 = { 0f100d???????? 0f114810 488d8de0100000 492bcf 4903cf 443821 75f8 }
		$sequence_4 = { 0fb6b48213d80600 8bd9 48c1e302 33d2 4c8bc3 8d040e 488d8d44030000 }
		$sequence_5 = { 41b801000000 8bd0 498bce e8???????? 4883f801 7405 418bc4 }
		$sequence_6 = { 8a4118 c3 4053 55 56 57 }
		$sequence_7 = { 4883ec20 488d05af930500 488bf9 488901 8bda 488b4918 e8???????? }
		$sequence_8 = { 4c63c0 4c8d0d4ddb0400 4c8d1df6050500 498bd0 418d4802 83f901 761b }
		$sequence_9 = { 458802 49ffc2 4883ee01 0f8574ffffff 418b7e10 458b8ea8000000 448bc7 }

	condition:
		7 of them and filesize < 1211392
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 4c8bf2 4d8903 488907 4d8b13 4d3bd1 0f84ec000000 483b442440 }
$sequence_1hex{ 83f801 0f8440ffffff 488b8da0020000 4833cc e8???????? 4c8d9c24b0030000 498b5b38 }
$sequence_2hex{ 48895c2408 57 4883ec20 488bd9 488d05341b0600 488901 }
$sequence_3hex{ 0f100d???????? 0f114810 488d8de0100000 492bcf 4903cf 443821 75f8 }
$sequence_4hex{ 0fb6b48213d80600 8bd9 48c1e302 33d2 4c8bc3 8d040e 488d8d44030000 }
$sequence_5hex{ 41b801000000 8bd0 498bce e8???????? 4883f801 7405 418bc4 }
$sequence_6hex{ 8a4118 c3 4053 55 56 57 }
$sequence_7hex{ 4883ec20 488d05af930500 488bf9 488901 8bda 488b4918 e8???????? }
$sequence_8hex{ 4c63c0 4c8d0d4ddb0400 4c8d1df6050500 498bd0 418d4802 83f901 761b }
$sequence_9hex{ 458802 49ffc2 4883ee01 0f8574ffffff 418b7e10 458b8ea8000000 448bc7 }

Condition

7 of them and filesize < 1211392

In plain words (Heuristic)

  • The file must be smaller than 1211392 (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: 3df8a6c8-8cad-530b-8fa5-c51892c15404

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