YARA · Malpedia signator rules
MALPEDIA_Win_Rc2Fm_Auto
autogenerated rule brought to you by yara-signator
- 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: Rc2Fm.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-rc2fm-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Rc2Fm_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "a08a9a06-9998-5e1d-a729-c63a91aa11fb"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.rc2fm"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.rc2fm_auto.yar#L1-L128"
= "N/A"
= "70864d4a72a67efe883f8d2dfa51c4b27e988571cf0f95ac8e7ae0d473a661a2"
= 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 = { 488d4c2448 c605????????01 e8???????? 84c0 7531 }
$sequence_1 = { 488d4507 4403c9 488d156d6c0100 4c8bc3 33c9 4889442420 e8???????? }
$sequence_2 = { 0fb64c246a 884c245e 0fb64c246e 88442461 0fb6442474 884c245f 0fb64c2470 }
$sequence_3 = { 4c8ba42460050000 4885c0 7412 488b0d???????? 4c8bc0 33d2 ff15???????? }
$sequence_4 = { 0fb7d5 4c8908 8b07 6642893408 830702 8b07 46892408 }
$sequence_5 = { 48f7d9 4d8d82a0b00200 4d8d8aa1b00200 4c03c1 4c03c9 b9000a0000 6666660f1f840000000000 }
$sequence_6 = { 4055 53 4154 4155 488dac24a8fdffff }
$sequence_7 = { 448bf2 418be8 4c8bf9 8d5707 3bc7 }
$sequence_8 = { 4885c0 7431 4533c9 4533c0 33c9 418d5101 48896bf8 }
$sequence_9 = { 448d4804 0fb60a 80f961 7203 80c1e0 c1c80b 0fb6c9 }
condition:
7 of them and filesize < 410624
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 488d4c2448 c605????????01 e8???????? 84c0 7531 } | |
| $sequence_1 | hex | { 488d4507 4403c9 488d156d6c0100 4c8bc3 33c9 4889442420 e8???????? } | |
| $sequence_2 | hex | { 0fb64c246a 884c245e 0fb64c246e 88442461 0fb6442474 884c245f 0fb64c2470 } | |
| $sequence_3 | hex | { 4c8ba42460050000 4885c0 7412 488b0d???????? 4c8bc0 33d2 ff15???????? } | |
| $sequence_4 | hex | { 0fb7d5 4c8908 8b07 6642893408 830702 8b07 46892408 } | |
| $sequence_5 | hex | { 48f7d9 4d8d82a0b00200 4d8d8aa1b00200 4c03c1 4c03c9 b9000a0000 6666660f1f840000000000 } | |
| $sequence_6 | hex | { 4055 53 4154 4155 488dac24a8fdffff } | |
| $sequence_7 | hex | { 448bf2 418be8 4c8bf9 8d5707 3bc7 } | |
| $sequence_8 | hex | { 4885c0 7431 4533c9 4533c0 33c9 418d5101 48896bf8 } | |
| $sequence_9 | hex | { 448d4804 0fb60a 80f961 7203 80c1e0 c1c80b 0fb6c9 } |
Condition
7 of them and filesize < 410624In plain words (Heuristic)
- The file must be smaller than 410624 (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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Drop a file here or click to chooseScanned locally with YARA-X. Files up to 200 MB.
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: a08a9a06-9998-5e1d-a729-c63a91aa11fb
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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