A single extension hit five different AI browser assistants and walked away with $20K in bounties from Anthropic, Google, Microsoft, and Perplexity. Not because it found five different bugs. Because it found one architectural blind spot that every vendor happened to share. Context This isn't a new category of vulnerability if you squint. It's a... Weiterlesen
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One Extension, Five Browsers, Zero Malicious Code: The Agent Hijack Nobody Priced In
A single extension hit five different AI browser assistants and walked away with $20K in bounties from Anthropic, Google, Microsoft, and Perplexity. Not because it found five different bugs. Because it found one architectural blind spot…
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CTI Threat Relationship Graph3 Knoten / 2 Relationen
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title: Detect Exploitation - One Extension, Five Browsers, Zero Malicious Code: The Agent Hijack Nobody Priced In
id: 0c93e59d-e0c3-4199-9357-eb558a611ad5
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 = "One Extension, Five Browsers, " ascii wide
condition:
any of them
}Infrastructure Blast Radius & Exposure
LOCALIZEDPerimeter & External Ingress
GEFÄHRDET (85%)
Lateral Movement & Pivot
Geringes Risiko
Data Stores & Crown Jewels
Geringes Risiko
Supply Chain & Cascading Reach
Geringes Risiko
tsecurity.de Cognitive Threat RAG
Fokus-Vektor:
Kognitive Analyse für identifizierte Bedrohung: Erhöhte Bedrohungslage im Bereich One Extension, Five Browsers, Zero Malic.... Basierend auf 368k Vektor-Korrelationen werden sofortige Isolationsmaßnahmen für betroffene Endpunkte empfohlen.
🛡️ Angriffsfläche & Exposure
Netzwerk/Remote-Zugriff ohne Vorauthentifizierung möglich.
⚡ Empfohlene Sofortmaßnahmen
- 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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