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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_MAL_Loader_Turtleloader_Nov23

Detects Tutle loader used in attacks against SysAid CVE-2023-47246

MalwareSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
Florian Roth
Date
2023-11-09
Modified
2023-12-05
Score / Quality
85 / 85

What this rule detects

Detects Tutle loader used in attacks against SysAid CVE-2023-47246

Targets: Windows PE.

It defines 6 patterns (3 text, 3 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
mal-loader-turtleloader-nov23.yarDetection Rule License 1.1
rule SIGNATURE_BASE_MAL_Loader_Turtleloader_Nov23 : CVE_2023_47246 FILE
{
	meta:
		description = "Detects Tutle loader used in attacks against SysAid CVE-2023-47246"
		author = "Florian Roth"
		id = "c7b5d03d-52c4-59b4-ac69-55e532a21340"
		date = "2023-11-09"
		modified = "2023-12-05"
		reference = "https://www.sysaid.com/blog/service-desk/on-premise-software-security-vulnerability-notification"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/expl_sysaid_cve_2023_47246.yar#L17-L38"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		hash = "b5acf14cdac40be590318dee95425d0746e85b1b7b1cbd14da66f21f2522bf4d"
		logic_hash = "14a1636ed4dc3c897fefe53946e67339f91da9e2fbed2c99b9b4119dcc2649c0"
		score = 85
		quality = 85
		tags = "CVE-2023-47246, FILE"

	strings:
		$s1 = "No key in args!" ascii fullword
		$s2 = "Bad data file!" ascii fullword
		$s3 = "Data file loaded. Running..." ascii
		$op1 = { 48 8d 55 c8 4c 8d 3d ac 8f 00 00 45 33 c9 45 33 d2 4d 8b e7 44 21 0a 45 33 db 4c 8d 3d 16 ec ff ff }
		$op2 = { 48 d3 e8 0f b6 c8 49 03 cb 49 81 c3 00 01 00 00 45 33 8c 8f a0 e4 00 00 41 83 fa 04 7c c7 41 ff c0 }
		$op3 = { 48 83 c1 04 48 ff ca 89 41 1c 75 ef 03 f6 48 83 c3 20 48 ff cd 0f 85 77 ff ff ff }

	condition:
		uint16( 0 ) == 0x5a4d and filesize < 200KB and 3 of them
}

Strings (6 patterns)

IdentifierTypeValueModifiers
$s1text"No key in args!"ascii fullword
$s2text"Bad data file!"ascii fullword
$s3text"Data file loaded. Running..."ascii
$op1hex{ 48 8d 55 c8 4c 8d 3d ac 8f 00 00 45 33 c9 45 33 d2 4d 8b e7 44 21 0a 45 33 db 4c 8d 3d 16 ec ff ff }
$op2hex{ 48 d3 e8 0f b6 c8 49 03 cb 49 81 c3 00 01 00 00 45 33 8c 8f a0 e4 00 00 41 83 fa 04 7c c7 41 ff c0 }
$op3hex{ 48 83 c1 04 48 ff ca 89 41 1c 75 ef 03 f6 48 83 c3 20 48 ff cd 0f 85 77 ff ff ff }

Condition

uint16( 0 ) == 0x5a4d and filesize < 200KB and 3 of them

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • The file must be smaller than 200KB (a cheap guard that skips large files).
  • At least 3 patterns in the rule must match.

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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).

  • b5acf14cdac40be590318dee95425d0746e85b1b7b1cbd14da66f21f2522bf4d

Licence & attribution

Author: Florian Roth

Source repository: Signature Base (Florian Roth / Nextron) @ 94a1c48d7a

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: c7b5d03d-52c4-59b4-ac69-55e532a21340

Tags:CVE_2023_47246FILE

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