YARA · Malpedia signator rules
MALPEDIA_Win_Merdoor_Auto
autogenerated rule brought to you by yara-signator
MalwareMerdoorMalpedia 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: Merdoor.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-merdoor-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Merdoor_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "ce97ad18-dd6a-5d38-b1cb-6f602f074318"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.merdoor"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.merdoor_auto.yar#L1-L125"
= "N/A"
= "f624f566a05578274e6d537f288d926b01192f8176e72a7f99468f16d9fee3ea"
= 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 = { c787e802000000000000 e8???????? 8987e4020000 c645fc02 }
$sequence_1 = { 50 ff7608 ffd7 8986f8000000 83befc00000000 750f 8d45d0 }
$sequence_2 = { 8d85e6fdffff 50 c785bcfdffff00000000 c785c0fdffff00000000 e8???????? 33c0 }
$sequence_3 = { 8987b4020000 8d45c0 50 6a00 57 68???????? 6a00 }
$sequence_4 = { 84c0 75f9 2bca 51 8d8598fcffff }
$sequence_5 = { 8b5514 8b5d08 c745fc00000000 83790400 8955e0 8955d8 }
$sequence_6 = { 8bd8 894df8 8bd3 8b4b04 80790d00 7518 }
$sequence_7 = { c1e706 8b0485f0070210 83c00c 03c7 50 ff15???????? 33c0 }
$sequence_8 = { 8987b0020000 8d45f0 50 8d45a0 50 ff15???????? 50 }
$sequence_9 = { ffd6 89858cfdffff 8d45c0 50 57 ffd6 }
condition:
7 of them and filesize < 307200
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { c787e802000000000000 e8???????? 8987e4020000 c645fc02 } | |
| $sequence_1 | hex | { 50 ff7608 ffd7 8986f8000000 83befc00000000 750f 8d45d0 } | |
| $sequence_2 | hex | { 8d85e6fdffff 50 c785bcfdffff00000000 c785c0fdffff00000000 e8???????? 33c0 } | |
| $sequence_3 | hex | { 8987b4020000 8d45c0 50 6a00 57 68???????? 6a00 } | |
| $sequence_4 | hex | { 84c0 75f9 2bca 51 8d8598fcffff } | |
| $sequence_5 | hex | { 8b5514 8b5d08 c745fc00000000 83790400 8955e0 8955d8 } | |
| $sequence_6 | hex | { 8bd8 894df8 8bd3 8b4b04 80790d00 7518 } | |
| $sequence_7 | hex | { c1e706 8b0485f0070210 83c00c 03c7 50 ff15???????? 33c0 } | |
| $sequence_8 | hex | { 8987b0020000 8d45f0 50 8d45a0 50 ff15???????? 50 } | |
| $sequence_9 | hex | { ffd6 89858cfdffff 8d45c0 50 57 ffd6 } |
Condition
7 of them and filesize < 307200In plain words (Heuristic)
- The file must be smaller than 307200 (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.
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: ce97ad18-dd6a-5d38-b1cb-6f602f074318
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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