YARA · Malpedia signator rules
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:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "3df8a6c8-8cad-530b-8fa5-c51892c15404"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.romcom_rat"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.romcom_rat_auto.yar#L1-L132"
= "N/A"
= "329446130971e3e9d98f830b9af67bc4ad5f748c380e9572e174475f4a618fbe"
= 75
= 75
= "FILE"
= "1"
= "yara-signator v0.6.0"
= "callsandjumps;datarefs;binvalue"
= "20260422"
= "a182e35da64e6d71cb55f125c4d4225196523f14"
= "20260504"
= "CC BY-SA 4.0"
= "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)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 4c8bf2 4d8903 488907 4d8b13 4d3bd1 0f84ec000000 483b442440 } | |
| $sequence_1 | hex | { 83f801 0f8440ffffff 488b8da0020000 4833cc e8???????? 4c8d9c24b0030000 498b5b38 } | |
| $sequence_2 | hex | { 48895c2408 57 4883ec20 488bd9 488d05341b0600 488901 } | |
| $sequence_3 | hex | { 0f100d???????? 0f114810 488d8de0100000 492bcf 4903cf 443821 75f8 } | |
| $sequence_4 | hex | { 0fb6b48213d80600 8bd9 48c1e302 33d2 4c8bc3 8d040e 488d8d44030000 } | |
| $sequence_5 | hex | { 41b801000000 8bd0 498bce e8???????? 4883f801 7405 418bc4 } | |
| $sequence_6 | hex | { 8a4118 c3 4053 55 56 57 } | |
| $sequence_7 | hex | { 4883ec20 488d05af930500 488bf9 488901 8bda 488b4918 e8???????? } | |
| $sequence_8 | hex | { 4c63c0 4c8d0d4ddb0400 4c8d1df6050500 498bd0 418d4802 83f901 761b } | |
| $sequence_9 | hex | { 458802 49ffc2 4883ee01 0f8574ffffff 418b7e10 458b8ea8000000 448bc7 } |
Condition
7 of them and filesize < 1211392In 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.
Test this rule in your browser
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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)
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
| 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 |
Tags:FILE
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