YARA · Volexity threat-intel

VOLEXITY_Apt_Webshell_Pl_Complyshell

Detection for the COMPLYSHELL webshell.

APT / threat actorVolexity threat-intelBSD 2-Clause LicenseCompiles with YARA-X

Author: threatintel@volexity.com
Date: 2023-12-13
Modified: 2024-01-12
Score / Quality: 75 / 80

What this rule detects

Detection for the COMPLYSHELL webshell.

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

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

apt-webshell-pl-complyshell.yarBSD 2-Clause License

rule VOLEXITY_Apt_Webshell_Pl_Complyshell : UTA0178 FILE MEMORY
{
	meta:
		description = "Detection for the COMPLYSHELL webshell."
		author = "threatintel@volexity.com"
		id = "6b44b5bc-a75f-573c-b9c3-562b7874e408"
		date = "2023-12-13"
		modified = "2024-01-12"
		reference = "TIB-20231215"
		source_url = "https://github.com/volexity/threat-intel/blob/3a9d0b52459877ee866a9a0ba06e60059b778c77/2024/2024-01-10 Ivanti Connect Secure/indicators/yara.yar#L3-L25"
		license_url = "https://github.com/volexity/threat-intel/blob/3a9d0b52459877ee866a9a0ba06e60059b778c77/LICENSE.txt"
		hash = "8bc8f4da98ee05c9d403d2cb76097818de0b524d90bea8ed846615e42cb031d2"
		logic_hash = "ff46691f1add20cff30fe996e2fb199ce42408e86d5642a8a43c430f2245b1f5"
		score = 75
		quality = 80
		tags = "UTA0178, FILE, MEMORY"
		os = "linux"
		os_arch = "all"
		scan_context = "file,memory"
		severity = "critical"
		license = "See license at https://github.com/volexity/threat-intel/blob/main/LICENSE.txt"
		rule_id = 9995
		version = 4

	strings:
		$s = "eval{my $c=Crypt::RC4->new("

	condition:
		$s
}

Strings (1 patterns)

Identifier	Type	Value	Modifiers
$s	text	"eval{my $c=Crypt::RC4->new("

Condition

$s

In plain words (Heuristic)

Pattern $s must be present.

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Sample hashes

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

8bc8f4da98ee05c9d403d2cb76097818de0b524d90bea8ed846615e42cb031d2

Licence & attribution

Author: threatintel@volexity.com

Source repository: Volexity threat-intel @ 3a9d0b5245

Licence: BSD 2-Clause License (stated in the rule's own meta)

“See license at https://github.com/volexity/threat-intel/blob/main/LICENSE.txt”

Original rule

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

Rule id: 6b44b5bc-a75f-573c-b9c3-562b7874e408

Metadata

os	linux
os_arch	all
scan_context	file,memory
severity	critical
rule_id	9995
version	4

Tags:UTA0178 FILE MEMORY

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