YARA · WithSecure Labs IOCs

WITHSECURELABS_LOOKVALJS

Detects a common string found across samples obfuscated with LOOKVALJS

Suspicious / huntingWithSecure Labs IOCsBSD 2-Clause LicenseCompiles with YARA-X

Author: WithSecure
Date: 2026-05-28
Score / Quality: 75 / 75

What this rule detects

Detects a common string found across samples obfuscated with LOOKVALJS

It defines 1 patterns (1 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

lookvaljs.yarBSD 2-Clause License

rule WITHSECURELABS_LOOKVALJS
{
	meta:
		description = "Detects a common string found across samples obfuscated with LOOKVALJS"
		author = "WithSecure"
		id = "35168369-c940-51ed-b1e2-a29c68bf4fec"
		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#L38-L47"
		license_url = "https://github.com/WithSecureLabs/iocs/blob/1a8384468dd292c6d2c5114c32e42dc0da1f5ae1/LICENSE"
		logic_hash = "4714815c64a6ba989d4d7554d3ac39702d067fd7299460a6db80dbd3e4b3abff"
		score = 75
		quality = 75
		tags = ""

	strings:
		$a = "currentValue = lookupTable" ascii wide

	condition:
		all of them
}

Strings (1 patterns)

Identifier	Type	Value	Modifiers
$a	text	"currentValue = lookupTable"	ascii wide

Condition

all of them

In plain words (Heuristic)

All patterns in the rule must match.

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References

https://github.com/WithSecureLabs/iocs

Licence & attribution

Author: WithSecure

Source repository: WithSecure Labs IOCs @ 1a8384468d

Licence: BSD 2-Clause License (repository licence)

Original rule

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

Rule id: 35168369-c940-51ed-b1e2-a29c68bf4fec

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