YARA · Volexity threat-intel

VOLEXITY_Susp_Jsp_General_Runtime_Exec_Req

Looks for a common design pattern in webshells where a request attribute is passed as an argument to exec().

Suspicious / huntingVolexity threat-intelBSD 2-Clause LicenseCompiles with YARA-X

Author: threatintel@volexity.com
Date: 2022-02-02
Modified: 2024-07-30
Score / Quality: 65 / 80

What this rule detects

Looks for a common design pattern in webshells where a request attribute is passed as an argument to exec().

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

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

susp-jsp-general-runtime-exec-req.yarBSD 2-Clause License

rule VOLEXITY_Susp_Jsp_General_Runtime_Exec_Req : FILE MEMORY
{
	meta:
		description = "Looks for a common design pattern in webshells where a request attribute is passed as an argument to exec()."
		author = "threatintel@volexity.com"
		id = "7f1539bd-a2f0-50dd-b500-ada4e0971d13"
		date = "2022-02-02"
		modified = "2024-07-30"
		reference = "https://github.com/volexity/threat-intel"
		source_url = "https://github.com/volexity/threat-intel/blob/3a9d0b52459877ee866a9a0ba06e60059b778c77/2022/2022-08-10 Mass exploitation of (Un)authenticated Zimbra RCE CVE-2022-27925/yara.yar#L35-L56"
		license_url = "https://github.com/volexity/threat-intel/blob/3a9d0b52459877ee866a9a0ba06e60059b778c77/LICENSE.txt"
		hash = "4935f0c50057e28efa7376c734a4c66018f8d20157b6584399146b6c79a6de15"
		logic_hash = "d3048aba80c1c39f1673931cd2d7c5ed83045603b0ad204073fd788d0103a6c8"
		score = 65
		quality = 80
		tags = "FILE, MEMORY"
		os = "win,linux"
		os_arch = "all"
		scan_context = "file,memory"
		severity = "high"
		license = "See license at https://github.com/volexity/threat-intel/blob/main/LICENSE.txt"
		rule_id = 6450
		version = 3

	strings:
		$s1 = "Runtime.getRuntime().exec(request." ascii

	condition:
		$s1
}

Strings (1 patterns)

Identifier	Type	Value	Modifiers
$s1	text	"Runtime.getRuntime().exec(request."	ascii

Condition

$s1

In plain words (Heuristic)

Pattern $s1 must be present.

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

https://github.com/volexity/threat-intel

Sample hashes

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

4935f0c50057e28efa7376c734a4c66018f8d20157b6584399146b6c79a6de15

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: 7f1539bd-a2f0-50dd-b500-ada4e0971d13

Metadata

os	win,linux
os_arch	all
scan_context	file,memory
severity	high
rule_id	6450
version	3

Tags:FILE MEMORY

VOLEXITY_Susp_Php_Call_User_Func
Suspicious / huntingVolexity threat-intel· threatintel@volexity.com· 2021-06-16
VOLEXITY_Susp_Php_Fileinput_Eval
Suspicious / huntingVolexity threat-intel· threatintel@volexity.com· 2021-06-16
VOLEXITY_Apt_Malware_Win_Deepdata_Module
APT / threat actorVolexity threat-intel· threatintel@volexity.com· 2024-07-30
VOLEXITY_Apt_Malware_Py_Dustpan_Pyloader
APT / threat actorVolexity threat-intel· threatintel@volexity.com· 2023-07-21
VOLEXITY_Apt_Malware_Win_Dustpan_Apihashes
APT / threat actorVolexity threat-intel· threatintel@volexity.com· 2023-08-17
VOLEXITY_Apt_Win_Iconicstealer
APT / threat actorVolexity threat-intel· threatintel@volexity.com· 2023-03-30
VOLEXITY_Apt_Delivery_Macro_Lazypine_Jeus_B
APT / threat actorVolexity threat-intel· threatintel@volexity.com· 2022-11-03
VOLEXITY_Apt_Delivery_Office_Macro_Lazypine_Jeus
APT / threat actorVolexity threat-intel· threatintel@volexity.com· 2022-11-02