YARA · SEKOIA.IO Community

SEKOIA_Unk_Quad7_Netd_Strings

Matches netd binary

GenericSEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X

Author: Sekoia.io
Date: 2024-08-23
Modified: 2024-12-19
Score / Quality: 75 / 80

What this rule detects

Matches netd binary

Targets: Linux ELF.

It defines 6 patterns (6 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

unk-quad7-netd-strings.yarDetection Rule License 1.1

rule SEKOIA_Unk_Quad7_Netd_Strings : FILE
{
	meta:
		description = "Matches netd binary"
		author = "Sekoia.io"
		id = "3f527f0e-c101-4356-9024-fc61aea644d1"
		date = "2024-08-23"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/unk_quad7_netd_strings.yar#L1-L23"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		hash = "cdb37db4543dde5ca2bd98a43699828f"
		logic_hash = "abd59c5fa0c4c73a2cd9a2263d5573d896c6c0d71d96bd59167b1e2d7fbf108e"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "./netd.dat"
		$ = "./sys.dat"
		$ = "--conf"
		$ = "--init"
		$ = "--nobg"
		$ = "Url is NULL."

	condition:
		uint32be( 0 ) == 0x7f454c46 and filesize < 1MB and 4 of them
}

Strings (6 patterns)

Identifier	Type	Value
$	text	"./netd.dat"
$	text	"./sys.dat"
$	text	"--conf"
$	text	"--init"
$	text	"--nobg"
$	text	"Url is NULL."

Condition

uint32be( 0 ) == 0x7f454c46 and filesize < 1MB and 4 of them

In plain words (Heuristic)

The file must start with the ELF header — a Linux/Unix executable.
The file must be smaller than 1MB (a cheap guard that skips large files).
At least 4 patterns in the rule must match.

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References

https://github.com/SEKOIA-IO/Community

Sample hashes

Hashes of samples the author lists in the rule's meta (look them up in your threat-intelligence platform).

cdb37db4543dde5ca2bd98a43699828f

Licence & attribution

Author: Sekoia.io

Source repository: SEKOIA.IO Community @ a438a5901a

Licence: Detection Rule License 1.1 (repository licence)

Original rule

Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.

Rule id: 3f527f0e-c101-4356-9024-fc61aea644d1

Metadata

version	1.0
classification	TLP:CLEAR

Tags:FILE

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