A Firefox add-on posing as a tool for opening protected PDF documents can quietly turn a signed-in browser into a route to Google account theft. It waits until installation to obtain the instructions that make it dangerous, leaving little suspicious code for store reviewers. The extension appeared in the Firefox Add-ons store on September 3, 2026.... Weiterlesen
Intelligence View
Malicious Firefox Extension Disguised as PDF Tool Steals Google Account Sessions
A Firefox add-on posing as a tool for opening protected PDF documents can quietly turn a signed-in browser into a route to Google account theft. It waits until installation to obtain the instructions that make it dangerous, leaving little…
SOC Incident Playbook: Vulnerability Remediation & Verification
title: Detect Exploitation - Malicious Firefox Extension Disguised as PDF Tool Steals Google Account Sessions
id: 64f55fed-d74e-4d5a-ba28-1d216d55cb06
status: experimental
description: Automatisch generierte SIEM-Erkennungsregel basierend auf CTI Intelligence
references:
- https://tsecurity.de/
author: iShareStuff CTI Automated Detection Engine
date: 2026-09-24
logsource:
category: network_connection
product: any
detection:
selection:
CommandLine|contains:
- 'exploit'
condition: selection
falsepositives:
- Legitime administrative Zugriffe oder Penetrationstests
level: high
tags:
- attack.initial_accessrule CTI_Threat_Indicator {
meta:
author = "iShareStuff CTI Automated Detection Engine"
date = "2026-09-24"
description = "YARA Signature for "
strings:
$str = "Malicious Firefox Extension Di" ascii wide
condition:
any of them
}tsecurity.de Cognitive Threat RAG
Kognitive Analyse für identifizierte Bedrohung: Erhöhte Bedrohungslage im Bereich Malicious Firefox Extension Disguised as.... Basierend auf 368k Vektor-Korrelationen werden sofortige Isolationsmaßnahmen für betroffene Endpunkte empfohlen.
Netzwerk/Remote-Zugriff ohne Vorauthentifizierung möglich.
- 1. Perimeter-Inspektion: Relevante Portfreigaben und exponierte Endpunkte unverzüglich scannen.
- 2. Patch-Applikation: Hersteller-Hotfix einspielen oder betroffene Daemons in isolierte DMZ-Segmente überführen.
- 3. Telemetrie & EDR-Alerts: Prozessaufrufe und Child-Processes auf anomale Shell-Spawns überwachen.
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