YARA · SEKOIA.IO Community
SEKOIA_Tool_Rsockstun_Strings
Detects Rsockstun based on strings
- Author
- Sekoia.io
- Date
- 2023-12-22
- Modified
- 2024-12-19
- Score / Quality
- 75 / 80
What this rule detects
Detects Rsockstun based on strings
Targets: Windows PE, Linux ELF.
It defines 4 patterns (4 text, 0 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
tool-rsockstun-strings.yarDetection Rule License 1.1
rule SEKOIA_Tool_Rsockstun_Strings : FILE
{
meta:
= "Detects Rsockstun based on strings"
= "Sekoia.io"
= "94d8cb39-3421-441c-8404-62a591b86912"
= "2023-12-22"
= "2024-12-19"
= "https://github.com/SEKOIA-IO/Community"
= "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/tool_rsockstun_strings.yar#L1-L20"
= "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
= "8faf1004ec56728f1e451734ed651e8f77a49faf7f232df82e0b4950a9f1d198"
= 75
= 80
= "FILE"
= "1.0"
= "TLP:CLEAR"
strings:
$ = "main.connectviaproxy"
$ = "main.connectForSocks"
$ = "main.listenForClients"
$ = "main.listenForSocks"
condition:
( uint32be( 0 ) == 0x7f454c46 or uint16be( 0 ) == 0x4d5a ) and filesize < 10MB and all of them
}
Strings (4 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $ | text | "main.connectviaproxy" | |
| $ | text | "main.connectForSocks" | |
| $ | text | "main.listenForClients" | |
| $ | text | "main.listenForSocks" |
Condition
( uint32be( 0 ) == 0x7f454c46 or uint16be( 0 ) == 0x4d5a ) and filesize < 10MB and all of themIn plain words (Heuristic)
- The file must start with “MZ” — a Windows executable (PE).
- The file must start with the ELF header — a Linux/Unix executable.
- The file must be smaller than 10MB (a cheap guard that skips large files).
- All patterns in the rule must match.
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References
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: 94d8cb39-3421-441c-8404-62a591b86912
Metadata
| version | 1.0 |
|---|---|
| classification | TLP:CLEAR |
Tags:FILE
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