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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_APT_RANSOM_Lockbit_Forensicartifacts_Nov23

Detects patterns found in Lockbit TA attacks exploiting Citrixbleed vulnerability CVE 2023-4966

APT / threat actorLockbitSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
Florian Roth
Date
2023-11-22
Modified
2023-12-05
Score / Quality
75 / 85

What this rule detects

Detects patterns found in Lockbit TA attacks exploiting Citrixbleed vulnerability CVE 2023-4966

Associated malware family: Lockbit.

It defines 2 patterns (2 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
apt-ransom-lockbit-forensicartifacts-nov23.yarDetection Rule License 1.1
rule SIGNATURE_BASE_APT_RANSOM_Lockbit_Forensicartifacts_Nov23
{
	meta:
		description = "Detects patterns found in Lockbit TA attacks exploiting Citrixbleed vulnerability CVE 2023-4966"
		author = "Florian Roth"
		id = "04bde599-2a5b-5a33-a6f1-67d57a564946"
		date = "2023-11-22"
		modified = "2023-12-05"
		reference = "https://www.cisa.gov/news-events/cybersecurity-advisories/aa23-325a"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/apt_ransom_lockbit_citrixbleed_nov23.yar#L73-L86"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "6ba1d47e2cac72143c4612c420777024f114afc007c7b15251a58819654aeff1"
		score = 75
		quality = 85
		tags = ""

	strings:
		$x1 = "taskkill /f /im sqlwriter.exe /im winmysqladmin.exe /im w3sqlmgr.exe"
		$x2 = " 1> \\\\127.0.0.1\\admin$\\__"

	condition:
		1 of ( $x* )
}

Strings (2 patterns)

IdentifierTypeValueModifiers
$x1text"taskkill /f /im sqlwriter.exe /im winmysqladmin.exe /im w3sqlmgr.exe"
$x2text" 1> \\\\127.0.0.1\\admin$\\__"

Condition

1 of ( $x* )

In plain words (Heuristic)

  • At least 1 patterns in ( $x* ) must match.

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References

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: 04bde599-2a5b-5a33-a6f1-67d57a564946

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