YARA · Malpedia signator rules
MALPEDIA_Win_Orpcbackdoor_Auto
autogenerated rule brought to you by yara-signator
MalwareOrpcbackdoorMalpedia 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: Orpcbackdoor.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-orpcbackdoor-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Orpcbackdoor_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "b1469adc-1aed-5d92-a8e2-21f306040afe"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.orpcbackdoor"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.orpcbackdoor_auto.yar#L1-L131"
= "N/A"
= "7cbc299a7e1f14b797d0ab31cc299afb88e54a5cff70962d9fc7cbe7fafc04f6"
= 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 = { e8???????? 8bc6 c1e002 50 8b85acf8ffff 0fb70485ac820310 }
$sequence_1 = { 6a00 8b4dfc e8???????? 8b45fc c9 }
$sequence_2 = { 0f94c0 c3 c705????????80700000 33c0 c705????????01000000 c705????????f0f1ffff c705????????a0450410 }
$sequence_3 = { e9???????? 8b45e4 2b450c 8b55e8 1b5510 c9 c20c00 }
$sequence_4 = { 59 8945d4 8b45d4 8945e0 8b450c 8945d8 837d0c00 }
$sequence_5 = { 32c0 ebf7 8bff 55 8bec 0fb7450e 2500800000 }
$sequence_6 = { ff75f4 ff75d4 8d4d0c e8???????? 8d45f8 50 ff75f4 }
$sequence_7 = { ff7518 ff7510 ff750c ff7508 ff75e0 e8???????? 83c418 }
$sequence_8 = { 894244 8b4df0 e8???????? ff75f8 ff75f4 8b45f0 ff7044 }
$sequence_9 = { cc e9???????? 55 8bec 8b4d08 b8???????? 3908 }
condition:
7 of them and filesize < 918528
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { e8???????? 8bc6 c1e002 50 8b85acf8ffff 0fb70485ac820310 } | |
| $sequence_1 | hex | { 6a00 8b4dfc e8???????? 8b45fc c9 } | |
| $sequence_2 | hex | { 0f94c0 c3 c705????????80700000 33c0 c705????????01000000 c705????????f0f1ffff c705????????a0450410 } | |
| $sequence_3 | hex | { e9???????? 8b45e4 2b450c 8b55e8 1b5510 c9 c20c00 } | |
| $sequence_4 | hex | { 59 8945d4 8b45d4 8945e0 8b450c 8945d8 837d0c00 } | |
| $sequence_5 | hex | { 32c0 ebf7 8bff 55 8bec 0fb7450e 2500800000 } | |
| $sequence_6 | hex | { ff75f4 ff75d4 8d4d0c e8???????? 8d45f8 50 ff75f4 } | |
| $sequence_7 | hex | { ff7518 ff7510 ff750c ff7508 ff75e0 e8???????? 83c418 } | |
| $sequence_8 | hex | { 894244 8b4df0 e8???????? ff75f8 ff75f4 8b45f0 ff7044 } | |
| $sequence_9 | hex | { cc e9???????? 55 8bec 8b4d08 b8???????? 3908 } |
Condition
7 of them and filesize < 918528In plain words (Heuristic)
- The file must be smaller than 918528 (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: b1469adc-1aed-5d92-a8e2-21f306040afe
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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