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YARA · SEKOIA.IO Community

SEKOIA_Backdoor_Win_Feedload

No description has been set in the source file - SEKOIA

MalwareFeed LoadSEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X
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

backdoor-win-feedload.yarDetection Rule License 1.1
rule SEKOIA_Backdoor_Win_Feedload : FILE
{
	meta:
		description = "No description has been set in the source file - SEKOIA"
		author = "Sekoia.io"
		id = "29cc46c4-7ed7-4a34-9749-a8ba8d37eb4c"
		date = "2023-10-24"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/backdoor_win_feedload.yar#L1-L15"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		hash = "f251144f7ad0be0045034a1fc33fb896e8c32874e0b05869ff5783e14c062486"
		logic_hash = "18eb3fc9b11ed21a76a2921c3d9681b09cf2f306263c2ece76c1bf4a65467777"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$s1 = "                                        C:\\LibreSS5\\crypto\\"

	condition:
		uint16be( 0 ) == 0x4d5a and #s1 > 200
}

Strings (1 patterns)

IdentifierTypeValueModifiers
$s1text" C:\\LibreSS5\\crypto\\"

Condition

uint16be( 0 ) == 0x4d5a and #s1 > 200

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • Pattern $s1 must occur > 200 times.

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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)

Original rule

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

version1.0
classificationTLP:CLEAR

Tags:FILE