YARA · SEKOIA.IO Community
SEKOIA_Backdoor_Win_Feedload
No description has been set in the source file - SEKOIA
- Author
- Sekoia.io
- Date
- 2023-10-24
- Modified
- 2024-12-19
- Score / Quality
- 75 / 80
What this rule detects
No description has been set in the source file - SEKOIA
Associated malware family: Feed Load.
Targets: Windows PE.
It defines 1 patterns (1 text, 0 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
rule SEKOIA_Backdoor_Win_Feedload : FILE
{
meta:
= "No description has been set in the source file - SEKOIA"
= "Sekoia.io"
= "29cc46c4-7ed7-4a34-9749-a8ba8d37eb4c"
= "2023-10-24"
= "2024-12-19"
= "https://github.com/SEKOIA-IO/Community"
= "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/backdoor_win_feedload.yar#L1-L15"
= "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
= "f251144f7ad0be0045034a1fc33fb896e8c32874e0b05869ff5783e14c062486"
= "18eb3fc9b11ed21a76a2921c3d9681b09cf2f306263c2ece76c1bf4a65467777"
= 75
= 80
= "FILE"
= "1.0"
= "TLP:CLEAR"
strings:
$s1 = " C:\\LibreSS5\\crypto\\"
condition:
uint16be( 0 ) == 0x4d5a and #s1 > 200
}
Strings (1 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $s1 | text | " C:\\LibreSS5\\crypto\\" |
Condition
uint16be( 0 ) == 0x4d5a and #s1 > 200In plain words (Heuristic)
- The file must start with “MZ” — a Windows executable (PE).
- Pattern $s1 must occur > 200 times.
Test this rule in your browser
Drop a file to scan it with this rule using YARA-X compiled to WebAssembly. Nothing is uploaded.
References
Sample hashes
Hashes of samples the author lists in the rule's meta (look them up in your threat-intelligence platform).
- f251144f7ad0be0045034a1fc33fb896e8c32874e0b05869ff5783e14c062486
Licence & attribution
Author: Sekoia.io
Source repository: SEKOIA.IO Community @ a438a5901a
Licence: Detection Rule License 1.1 (repository licence)
Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.
Rule id: 29cc46c4-7ed7-4a34-9749-a8ba8d37eb4c
Metadata
| version | 1.0 |
|---|---|
| classification | TLP:CLEAR |
Tags:FILE
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