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DITEKSHEN_MALWARE_Win_Rasftuby

Detects Rasftuby/DarkCrystal

MalwareRasftubyditekSHen 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 Rasftuby/DarkCrystal

Associated malware family: Rasftuby.

Targets: Windows PE.

It defines 9 patterns (9 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
malware-win-rasftuby.yarBSD 2-Clause License
rule DITEKSHEN_MALWARE_Win_Rasftuby : FILE
{
	meta:
		description = "Detects Rasftuby/DarkCrystal"
		author = "ditekSHen"
		id = "908624a8-0068-5512-a5d0-77ce1f4efd80"
		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#L2933-L2950"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "b769c1986d23173cf8a8a3c8a14d388a7c0327e46d936fc97c449dc55f2a5575"
		score = 75
		quality = 75
		tags = "FILE"
		clamav_sig = "MALWARE.Win.Trojan.DarkCrystal.RAT-Rasftuby"

	strings:
		$s1 = "/DCRS/main.php?data=active" fullword ascii wide
		$s2 = "/socket.php?type=__ds_" ascii wide
		$s3 = "/uploader.php" fullword ascii wide
		$s4 = "del \\\"%USERPROFILE%\\\\AppData\\\\Roaming\\\\Microsoft\\\\Windows\\\\Start Menu\\\\Programs\\\\Startup\\\\System.lnk\\\"" fullword ascii wide
		$s5 = "Host:{0},Port:{1},User:{2},Pass:{3}<STR>" fullword ascii wide
		$s6 = "keyloggerstart_status" fullword ascii wide
		$s7 = "keyloggerstop_status" fullword ascii wide
		$s8 = "[PRINT SCREEN]" fullword ascii wide
		$s9 = "DCS.Internal" ascii

	condition:
		uint16( 0 ) == 0x5a4d and 5 of ( $s* )
}

Strings (9 patterns)

IdentifierTypeValueModifiers
$s1text"/DCRS/main.php?data=active"fullword ascii wide
$s2text"/socket.php?type=__ds_"ascii wide
$s3text"/uploader.php"fullword ascii wide
$s4text"del \\\"%USERPROFILE%\\\\AppData\\\\Roaming\\\\Microsoft\\\\Windows\\\\Start Menu\\\\Programs\\\\Startup\\\\System.lnk\\\""fullword ascii wide
$s5text"Host:{0},Port:{1},User:{2},Pass:{3}<STR>"fullword ascii wide
$s6text"keyloggerstart_status"fullword ascii wide
$s7text"keyloggerstop_status"fullword ascii wide
$s8text"[PRINT SCREEN]"fullword ascii wide
$s9text"DCS.Internal"ascii

Condition

uint16( 0 ) == 0x5a4d and 5 of ( $s* )

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • At least 5 patterns in ( $s* ) must match.

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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: 908624a8-0068-5512-a5d0-77ce1f4efd80

Metadata

clamav_sigMALWARE.Win.Trojan.DarkCrystal.RAT-Rasftuby

Tags:FILE

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