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WITHSECURELABS_DAYLIGHT

Detects common strings found across samples obfuscated with DAYLIGHT

Suspicious / huntingWithSecure Labs IOCsBSD 2-Clause LicenseCompiles with YARA-X
Author
WithSecure
Date
2026-05-28
Score / Quality
75 / 73

What this rule detects

Detects common strings found across samples obfuscated with DAYLIGHT

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

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
daylight.yarBSD 2-Clause License
rule WITHSECURELABS_DAYLIGHT
{
	meta:
		description = "Detects common strings found across samples obfuscated with DAYLIGHT"
		author = "WithSecure"
		id = "bbd4aad0-a156-5692-9b4a-ebdb5143a2bf"
		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#L1-L11"
		license_url = "https://github.com/WithSecureLabs/iocs/blob/1a8384468dd292c6d2c5114c32e42dc0da1f5ae1/LICENSE"
		logic_hash = "bc16cbe538d2d4bba7ec3332b525d79e74ab9dec8f545e5f12720e185b24d3dd"
		score = 75
		quality = 73
		tags = ""

	strings:
		$a = "$encryptedstream, $keystream" nocase ascii wide
		$b = "Daylight savings time is active" ascii wide

	condition:
		any of them
}

Strings (2 patterns)

IdentifierTypeValueModifiers
$atext"$encryptedstream, $keystream"nocase ascii wide
$btext"Daylight savings time is active"ascii wide

Condition

any of them

In plain words (Heuristic)

  • At least one pattern 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: bbd4aad0-a156-5692-9b4a-ebdb5143a2bf

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