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DITEKSHEN_MALWARE_Win_Dlagent12

Detects downloader agent

MalwareDlagent12ditekSHen detectionBSD 2-Clause LicenseCompiles with YARA-X
Author
ditekSHen
Date
2020-11-06
Modified
2024-11-01
Score / Quality
75 / 75

What this rule detects

Detects downloader agent

Associated malware family: Dlagent12.

Targets: Windows PE.

It defines 3 patterns (3 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
malware-win-dlagent12.yarBSD 2-Clause License
rule DITEKSHEN_MALWARE_Win_Dlagent12 : FILE
{
	meta:
		description = "Detects downloader agent"
		author = "ditekSHen"
		id = "841b998b-99d1-50d8-bc7b-75b2a8e690bf"
		date = "2020-11-06"
		modified = "2024-11-01"
		reference = "https://github.com/ditekshen/detection"
		source_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/yara/malware.yar#L5983-L5993"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "b9845414f4ce4cc25b75a8de7569c4135bbb7ba9098fd4c50d7ac80302e99b8f"
		score = 75
		quality = 75
		tags = "FILE"

	strings:
		$s1 = "WebClient" fullword ascii
		$s2 = "DownloadData" fullword ascii
		$s3 = "packet_server" fullword wide

	condition:
		uint16( 0 ) == 0x5a4d and all of them and filesize < 50KB
}

Strings (3 patterns)

IdentifierTypeValueModifiers
$s1text"WebClient"fullword ascii
$s2text"DownloadData"fullword ascii
$s3text"packet_server"fullword wide

Condition

uint16( 0 ) == 0x5a4d and all of them and filesize < 50KB

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • The file must be smaller than 50KB (a cheap guard that skips large files).
  • All patterns in the rule must match.

Test this rule in your browser

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Drop a file here or click to chooseScanned locally with YARA-X. Files up to 200 MB.

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References

Licence & attribution

Author: ditekSHen

Source repository: ditekSHen detection @ e76c93dcde

Licence: BSD 2-Clause License (repository licence)

Copyright notice: Copyright 2021 by ditekSHen (https://github.com/ditekshen/detection).

Original rule

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

Rule id: 841b998b-99d1-50d8-bc7b-75b2a8e690bf

Tags:FILE

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