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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_MAL_Cisco_LINE_VIPER_Shellcode_Deobfuscation_Routine

Detects LINE VIPER Cisco ASA malware code as part of a shellcode deobfuscation routine.

MalwareSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
NCSC
Date
2025-09-25
Modified
2026-05-15
Score / Quality
85 / 85

What this rule detects

Detects LINE VIPER Cisco ASA malware code as part of a shellcode deobfuscation routine.

It defines 4 patterns (3 text, 1 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
mal-cisco-line-viper-shellcode-deobfuscation-routine.yarDetection Rule License 1.1
rule SIGNATURE_BASE_MAL_Cisco_LINE_VIPER_Shellcode_Deobfuscation_Routine
{
	meta:
		description = "Detects LINE VIPER Cisco ASA malware code as part of a shellcode deobfuscation routine."
		author = "NCSC"
		id = "608282b5-f296-5d21-b88b-92cd53128d89"
		date = "2025-09-25"
		modified = "2026-05-15"
		reference = "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/apt_cisco_asa_lineviper_rayinitiator_sep25.yar#L78-L98"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "9feb3703a99c529b28c12646a0834e77d3377f1fd75ec69c46201cb0d4d22775"
		score = 85
		quality = 85
		tags = ""

	strings:
		$xc1 = {
         48 8B 7F 08 48 8D 5F 70 49 C7 C1 00 18 00 00 49 C7 C0
         20 00 00 00 48 89 DF 8A 01 32 07 48 FF C7 41 FF C8 4D 85 C0 75 F3
         88 01 48 FF C1 41 FF C9 4D 85 C9 75 DA
      }
		$x1 = "SIt/CEiNX3BJx8EAGAAAScfAIAAAAEiJ34oBMgdI/8dB/8hNhcB184gBSP/BQf/JTYXJdd"
		$x2 = "iLfwhIjV9wScfBABgAAEnHwCAAAABIid+KATIHSP/HQf/ITYXAdfOIAUj/wUH/yU2FyXXa"
		$x3 = "Ii38ISI1fcEnHwQAYAABJx8AgAAAASInfigEyB0j/x0H/yE2FwHXziAFI/8FB/8lNhcl12"

	condition:
		1 of them
}

Strings (4 patterns)

IdentifierTypeValueModifiers
$xc1hex{ 48 8B 7F 08 48 8D 5F 70 49 C7 C1 00 18 00 00 49 C7 C0 20 00 00 00 48 89 DF 8A 01 32 07 48 FF C7 41 FF C8 4D 85 C0 75 F3 88 01 48 FF …
$x1text"SIt/CEiNX3BJx8EAGAAAScfAIAAAAEiJ34oBMgdI/8dB/8hNhcB184gBSP/BQf/JTYXJdd"
$x2text"iLfwhIjV9wScfBABgAAEnHwCAAAABIid+KATIHSP/HQf/ITYXAdfOIAUj/wUH/yU2FyXXa"
$x3text"Ii38ISI1fcEnHwQAYAABJx8AgAAAASInfigEyB0j/x0H/yE2FwHXziAFI/8FB/8lNhcl12"

Condition

1 of them

In plain words (Heuristic)

  • At least 1 patterns in the rule must match.

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References

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: 608282b5-f296-5d21-b88b-92cd53128d89

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