Skip to content
yararules.org
Menu

YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_APT_Sandworm_Cyclopsblink_Default_Config_Values

Detects the code bytes used to set default Cyclops Blink configuration values

APT / threat actorSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
NCSC
Date
2022-02-23
Modified
2023-12-05
Score / Quality
75 / 85

What this rule detects

Detects the code bytes used to set default Cyclops Blink configuration values

Targets: Linux ELF.

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

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
apt-sandworm-cyclopsblink-default-config-values.yarDetection Rule License 1.1
rule SIGNATURE_BASE_APT_Sandworm_Cyclopsblink_Default_Config_Values : FILE
{
	meta:
		description = "Detects the code bytes used to set default Cyclops Blink configuration values"
		author = "NCSC"
		id = "04067609-1173-51f2-907f-2a236aae6c7c"
		date = "2022-02-23"
		modified = "2023-12-05"
		reference = "https://www.ncsc.gov.uk/news/joint-advisory-shows-new-sandworm-malware-cyclops-blink-replaces-vpnfilter"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/apt_sandworm_cyclops_blink.yar#L152-L174"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		hash = "3adf9a59743bc5d8399f67cab5eb2daf28b9b863"
		hash = "c59bc17659daca1b1ce65b6af077f86a648ad8a8"
		logic_hash = "180993057c110c0c0327b673c6d6e251534012de51cf6475838691e0942a1aa8"
		score = 75
		quality = 85
		tags = "FILE"

	strings:
		$ = {38 00 00 19 90 09 01 A4}
		$ = {3C 00 00 01 60 00 80 00 90 09 01 A8}
		$ = {38 00 40 00 90 09 01 AC}
		$ = {38 00 01 0B 90 09 01 B0}
		$ = {38 00 27 11 90 09 01 C0}

	condition:
		( uint32( 0 ) == 0x464c457f ) and ( 3 of them )
}

Strings (5 patterns)

IdentifierTypeValueModifiers
$hex{38 00 00 19 90 09 01 A4}
$hex{3C 00 00 01 60 00 80 00 90 09 01 A8}
$hex{38 00 40 00 90 09 01 AC}
$hex{38 00 01 0B 90 09 01 B0}
$hex{38 00 27 11 90 09 01 C0}

Condition

( uint32( 0 ) == 0x464c457f ) and ( 3 of them )

In plain words (Heuristic)

  • The file must start with the ELF header — a Linux/Unix executable.
  • At least 3 patterns in the rule must match.

Test this rule in your browser

Drop a file to scan it with this rule using YARA-X compiled to WebAssembly. Nothing is uploaded.

Drop a file here or click to chooseScanned locally with YARA-X. Files up to 200 MB.

Open in editor

References

Sample hashes

Hashes of samples the author lists in the rule's meta (look them up in your threat-intelligence platform).

  • 3adf9a59743bc5d8399f67cab5eb2daf28b9b863
  • c59bc17659daca1b1ce65b6af077f86a648ad8a8

Licence & attribution

Author: NCSC

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: 04067609-1173-51f2-907f-2a236aae6c7c

Tags:FILE

Related rules