YARA · Malpedia signator rules
MALPEDIA_Win_Microbackdoor_Auto
autogenerated rule brought to you by yara-signator
MalwareMicrobackdoorMalpedia 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: Microbackdoor.
It defines 16 patterns (0 text, 16 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-microbackdoor-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Microbackdoor_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "2b2908cd-6655-5e02-93d7-7005a043c66a"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.microbackdoor"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.microbackdoor_auto.yar#L1-L179"
= "N/A"
= "0a513a7de44a9667b235a624c68cdce9b5a9c79e64875e766c3d89bd61f0b348"
= 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 = { 56 ffd7 6810270000 ff15???????? }
$sequence_1 = { 90 0fb7841120840000 488d4902 6689840dae010000 6685c0 75e7 0f1f8000000000 }
$sequence_2 = { 8bec 83ec18 56 57 33c0 c745fc14000000 8d7de8 }
$sequence_3 = { 5d c3 55 8bec ff750c ff15???????? 50 }
$sequence_4 = { 0f84f1010000 0f1f00 8b8578020000 85c0 7548 488b4c2458 488d9568020000 }
$sequence_5 = { 4156 4881ec58020000 4c8bf1 ba0000a000 b940000000 ff15???????? }
$sequence_6 = { 8bce 0fb7811c100010 6689840dbcfbffff 03cb 6685c0 }
$sequence_7 = { ff750c 57 ff15???????? 57 ff7508 e8???????? }
$sequence_8 = { 8bd0 e8???????? 33c0 4881c438010000 5b 5d c3 }
$sequence_9 = { 833f0a 7207 33c0 e9???????? 53 33db 56 }
$sequence_10 = { 33db 56 8b750c 43 85f6 0f84a9010000 }
$sequence_11 = { 488b4c2430 ff15???????? eb0e 488d0d8b490000 8bd0 e8???????? }
$sequence_12 = { ff15???????? 488d442458 488d9510010000 4889442448 }
$sequence_13 = { 8d45fc 50 ff15???????? 8b3d???????? 8bf0 85f6 }
$sequence_14 = { 664489642440 6689442442 ff15???????? 85c0 0f855b030000 418bce }
$sequence_15 = { ff15???????? 8b4b34 85c9 0f848e000000 ffc9 746a }
condition:
7 of them and filesize < 123904
}
Strings (16 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 56 ffd7 6810270000 ff15???????? } | |
| $sequence_1 | hex | { 90 0fb7841120840000 488d4902 6689840dae010000 6685c0 75e7 0f1f8000000000 } | |
| $sequence_2 | hex | { 8bec 83ec18 56 57 33c0 c745fc14000000 8d7de8 } | |
| $sequence_3 | hex | { 5d c3 55 8bec ff750c ff15???????? 50 } | |
| $sequence_4 | hex | { 0f84f1010000 0f1f00 8b8578020000 85c0 7548 488b4c2458 488d9568020000 } | |
| $sequence_5 | hex | { 4156 4881ec58020000 4c8bf1 ba0000a000 b940000000 ff15???????? } | |
| $sequence_6 | hex | { 8bce 0fb7811c100010 6689840dbcfbffff 03cb 6685c0 } | |
| $sequence_7 | hex | { ff750c 57 ff15???????? 57 ff7508 e8???????? } | |
| $sequence_8 | hex | { 8bd0 e8???????? 33c0 4881c438010000 5b 5d c3 } | |
| $sequence_9 | hex | { 833f0a 7207 33c0 e9???????? 53 33db 56 } | |
| $sequence_10 | hex | { 33db 56 8b750c 43 85f6 0f84a9010000 } | |
| $sequence_11 | hex | { 488b4c2430 ff15???????? eb0e 488d0d8b490000 8bd0 e8???????? } | |
| $sequence_12 | hex | { ff15???????? 488d442458 488d9510010000 4889442448 } | |
| $sequence_13 | hex | { 8d45fc 50 ff15???????? 8b3d???????? 8bf0 85f6 } | |
| $sequence_14 | hex | { 664489642440 6689442442 ff15???????? 85c0 0f855b030000 418bce } | |
| $sequence_15 | hex | { ff15???????? 8b4b34 85c9 0f848e000000 ffc9 746a } |
Condition
7 of them and filesize < 123904In plain words (Heuristic)
- The file must be smaller than 123904 (a cheap guard that skips large files).
- At least 7 patterns in the rule must match.
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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: 2b2908cd-6655-5e02-93d7-7005a043c66a
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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