YARA · Malpedia signator rules
MALPEDIA_Win_Outlook_Backdoor_Auto
autogenerated rule brought to you by yara-signator
MalwareOutlook BackdoorMalpedia 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: Outlook Backdoor.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-outlook-backdoor-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Outlook_Backdoor_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "25cc6be4-aee4-5214-b5d7-8c9f1dc8c5a6"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.outlook_backdoor"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.outlook_backdoor_auto.yar#L1-L132"
= "N/A"
= "842c87c24f07bbae0fd91c260c830edf0fa4abc10a9d19fdfaac30d66518fcca"
= 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 = { 0f8412fdffff ff442410 ff4c2418 837c241800 7fdb e9???????? 56 }
$sequence_1 = { 6a11 53 ff7004 ff30 53 51 ff5214 }
$sequence_2 = { 5f 8d45e4 50 56 897de4 e8???????? eb23 }
$sequence_3 = { 40 83f80c 72f5 8b4d08 8d45ec 50 e8???????? }
$sequence_4 = { 8bf0 c645fc06 e8???????? 6a00 6a01 8d4dcc 894308 }
$sequence_5 = { eb3a 8ad0 80ea21 80fa5d 77f0 3c3d }
$sequence_6 = { 83c618 3bc3 7419 57 8b4808 3b4d08 7509 }
$sequence_7 = { 8bce e8???????? 8d45c4 50 ff7664 8d45a8 8d4e48 }
$sequence_8 = { 83ec10 56 57 8d442408 e8???????? 8b30 8b7804 }
$sequence_9 = { e8???????? 81ec88000000 8365ec00 56 8d856cffffff 50 }
condition:
7 of them and filesize < 2912256
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 0f8412fdffff ff442410 ff4c2418 837c241800 7fdb e9???????? 56 } | |
| $sequence_1 | hex | { 6a11 53 ff7004 ff30 53 51 ff5214 } | |
| $sequence_2 | hex | { 5f 8d45e4 50 56 897de4 e8???????? eb23 } | |
| $sequence_3 | hex | { 40 83f80c 72f5 8b4d08 8d45ec 50 e8???????? } | |
| $sequence_4 | hex | { 8bf0 c645fc06 e8???????? 6a00 6a01 8d4dcc 894308 } | |
| $sequence_5 | hex | { eb3a 8ad0 80ea21 80fa5d 77f0 3c3d } | |
| $sequence_6 | hex | { 83c618 3bc3 7419 57 8b4808 3b4d08 7509 } | |
| $sequence_7 | hex | { 8bce e8???????? 8d45c4 50 ff7664 8d45a8 8d4e48 } | |
| $sequence_8 | hex | { 83ec10 56 57 8d442408 e8???????? 8b30 8b7804 } | |
| $sequence_9 | hex | { e8???????? 81ec88000000 8365ec00 56 8d856cffffff 50 } |
Condition
7 of them and filesize < 2912256In plain words (Heuristic)
- The file must be smaller than 2912256 (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: 25cc6be4-aee4-5214-b5d7-8c9f1dc8c5a6
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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