PoisonedRefresh rootkit injects PHP web shells into F5 BIG-IP APM Apache memory, leaving no disk artifacts. SophosLabs published a detailed technical analysis on September 8, 2026, of a Linux implant, dubbed PoisonedRefresh by ESET, they found in compromised F5 BIG-IP Access Policy Manager environments. Sophos tracks it as Linux/Agnt-IC. F5 has... Weiterlesen
Intelligence View
PoisonedRefresh: A Fileless Linux Rootkit That Injects PHP Web Shells Into F5 BIG-IP APM Server Memory
PoisonedRefresh rootkit injects PHP web shells into F5 BIG-IP APM Apache memory, leaving no disk artifacts. SophosLabs published a detailed technical analysis on September 8, 2026, of a Linux implant, dubbed PoisonedRefresh by ESET, they…
SOC Incident Playbook: Vulnerability Remediation & Verification
title: Detect Exploitation - PoisonedRefresh: A Fileless Linux Rootkit That Injects PHP Web Shells Into F5 BIG-IP APM Server Memory
id: 39340b1e-c789-4bd2-9e24-14f3d319a467
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 = "PoisonedRefresh: A Fileless Li" ascii wide
condition:
any of them
}tsecurity.de Cognitive Threat RAG
Kognitive Analyse für identifizierte Bedrohung: Erhöhte Bedrohungslage im Bereich PoisonedRefresh: A Fileless Linux Rootki.... 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.
SOCIAL SHARE CARD GENERATOR