Webserver Detection: SonicWall SSL VPN Jarrewrite Exploitation URI and User-Agent Payloads

Flags web requests to /cgi-bin/jarrewrite.sh with user-agent indicators consistent with command injection exploitation.

FreeReviewedSigma · High · v5

Category: webserver
Author: Florian Roth (Nextron Systems) (SigmaHQ), DRL 1.1
Published: 2021-01-25
Updated: 2026-07-31

ATT&CK techniques

Initial Access

Recon
Resource Dev
Initial Access
- T1190Exploit Public-Facing Application
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule flags likely exploitation attempts targeting SonicWall SSL VPN via requests to the '/cgi-bin/jarrewrite.sh' endpoint combined with suspicious user-agent payload patterns. Attackers may use shell metacharacters and command execution strings (e.g., ':;', '() {', '/bin/bash -c') to trigger unauthorized script execution. The detection relies on webserver request telemetry capturing the URL query and the User-Agent value.

Reporting behind it

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Webserver Detection: SonicWall SSL VPN Jarrewrite Exploitation URI and User-Agent Payloads

Pivot detection · T1190 · 9 related

Changelog

v5
Candidate ingested via manual entry.2026-07-31
v4
Candidate ingested via manual entry.2026-07-31
v3
Candidate ingested via manual entry.2026-07-31
v2
Candidate ingested via manual entry.2026-07-31
v1
No changelog recorded for this version.2026-07-30

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

sonicwall-ssl-vpn-jarrewrite-exploit-attempts-via-suspicious-http-query-and-user-6f55f047

title: "Webserver Detection: SonicWall SSL VPN Jarrewrite Exploitation URI and User-Agent Payloads"
id: 99987df5-daa9-418e-8caa-f29a494fbc1e
status: test
description: This rule flags likely exploitation attempts targeting SonicWall SSL VPN via requests to the '/cgi-bin/jarrewrite.sh' endpoint combined with suspicious user-agent payload patterns. Attackers may use shell metacharacters and command execution strings (e.g., ':;', '() {', '/bin/bash -c') to trigger unauthorized script execution. The detection relies on webserver request telemetry capturing the URL query and the User-Agent value.
references:
  - https://web.archive.org/web/20210126045316/https://darrenmartyn.ie/2021/01/24/visualdoor-sonicwall-ssl-vpn-exploit/
  - https://github.com/darrenmartyn/VisualDoor
  - https://github.com/SigmaHQ/sigma/blob/master/rules-emerging-threats/2021/Exploits/VisualDoor-Exploit/web_sonicwall_jarrewrite_exploit.yml
author: Florian Roth (Nextron Systems), Huntrule Team
date: 2021-01-25
modified: 2023-04-27
tags:
  - attack.t1190
  - attack.initial-access
  - detection.emerging-threats
logsource:
  category: webserver
detection:
  selection:
    cs-uri-query|contains: /cgi-bin/jarrewrite.sh
    cs-user-agent|contains:
      - :;
      - () {
      - /bin/bash -c
  condition: selection
falsepositives:
  - Unknown
level: high
license: DRL-1.1
related:
  - id: 6f55f047-112b-4101-ad32-43913f52db46
    type: derived

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