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WITHSECURELABS_Phantomrelay_Fingerprint

Detects PhantomRelay's fingerprinting script

GenericWithSecure Labs IOCsBSD 2-Clause LicenseCompiles with YARA-X
Author
WithSecure
Date
2026-05-28
Score / Quality
75 / 75

What this rule detects

Detects PhantomRelay's fingerprinting script

It defines 5 patterns (5 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
phantomrelay-fingerprint.yarBSD 2-Clause License
rule WITHSECURELABS_Phantomrelay_Fingerprint
{
	meta:
		description = "Detects PhantomRelay's fingerprinting script"
		author = "WithSecure"
		id = "b7191fdf-f270-5949-bb54-a5dea2a6e2a0"
		date = "2026-05-28"
		modified = "2026-05-28"
		reference = "https://github.com/WithSecureLabs/iocs"
		source_url = "https://github.com/WithSecureLabs/iocs/blob/1a8384468dd292c6d2c5114c32e42dc0da1f5ae1/GREYVIBE/greyvibe.yara#L75-L89"
		license_url = "https://github.com/WithSecureLabs/iocs/blob/1a8384468dd292c6d2c5114c32e42dc0da1f5ae1/LICENSE"
		logic_hash = "88e2cf9106731fe9e7e76ed00a09e81828029e68e0e40ca58c8efad93e9e16b5"
		score = 75
		quality = 75
		tags = ""
		target_entity = "file"

	strings:
		$a1 = "$env:COMPUTERNAME"
		$a2 = "$env:USERNAME"
		$a3 = "$PID"
		$a4 = "Win32_Computer"
		$user_agent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/534.36 (KHTML, like Gecko) Chrome/95.4.4476.124 Safari/537.36"

	condition:
		all of them
}

Strings (5 patterns)

IdentifierTypeValueModifiers
$a1text"$env:COMPUTERNAME"
$a2text"$env:USERNAME"
$a3text"$PID"
$a4text"Win32_Computer"
$user_agenttext"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/534.36 (KHTML, like Gecko) Chrome/95.4.4476.124 Safari/537.36"

Condition

all of them

In plain words (Heuristic)

  • All patterns in the rule must match.

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References

Licence & attribution

Author: WithSecure

Source repository: WithSecure Labs IOCs @ 1a8384468d

Licence: BSD 2-Clause License (repository licence)

Copyright notice: Copyright (c) 2022, WithSecure Oyj

Original rule

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

Rule id: b7191fdf-f270-5949-bb54-a5dea2a6e2a0

Metadata

target_entityfile

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