TuxBot v3: Defending Against LLM-Enhanced IoT Botnets

---
title: TuxBot v3 - Suspicious Binary Execution from Common IoT Directories
id: 8a2b3c4d-5e6f-7a8b-9c0d-1e2f3a4b5c6d
status: experimental
description: Detects execution of binaries from temporary or web directories often used by IoT botnets like TuxBot v3 for staging payloads.
references:
 - https://unit42.paloaltonetworks.com/tuxbot-v3-evolution-iot-botnet/
author: Security Arsenal
date: 2026/05/22
tags:
 - attack.initial_access
 - attack.t1190
logsource:
 category: process_creation
 product: linux
detection:
 selection:
   Image|contains:
     - '/tmp/'
     - '/var/tmp/'
     - '/dev/shm/'
     - '/var/www/html/'
   Image|endswith:
     - '.bin'
     - '.sh'
     - '.run'
 condition: selection
falsepositives:
 - Legitimate administrative scripts running from temp (rare)
level: high
---
title: TuxBot v3 - Suspicious Parent-Process Relationship (Web Shell)
id: 9b3c4d5e-6f7a-8b9c-0d1e-2f3a4b5c6d7e
status: experimental
description: Detects web server processes spawning shell interpreters, a common technique used by IoT botnets to gain persistence after initial exploitation.
references:
 - https://unit42.paloaltonetworks.com/tuxbot-v3-evolution-iot-botnet/
author: Security Arsenal
date: 2026/05/22
tags:
 - attack.execution
 - attack.t1059.004
logsource:
 category: process_creation
 product: linux
detection:
 selection:
   ParentImage|contains:
     - '/httpd'
     - '/nginx'
     - '/lighttpd'
     - '/apache'
   Image|endswith:
     - '/bash'
     - '/sh'
     - '/dash'
 condition: selection
falsepositives:
 - Legitimate system administration CGI scripts
level: medium

// Hunt for TuxBot v3 C2 beacons and suspicious process execution
// Query assumes Syslog/CEF or DeviceProcessEvents are ingested
DeviceProcessEvents
| where Timestamp > ago(7d)
| whereFolderPath has "/tmp/" or FolderPath has "/var/tmp/" or FolderPath has "/dev/shm/"
| where FileName !in~ ("apt", "yum", "dpkg", "systemd")
| project Timestamp, DeviceName, AccountName, FileName, FolderPath, ProcessCommandLine, InitiatingProcessFileName
| extend Artifact = FolderPath "/" FileName
| distinct Artifact, DeviceName, ProcessCommandLine
| sort by Timestamp desc

-- Hunt for TuxBot v3 artifacts: suspicious binaries in writable directories and established C2 connections
SELECT 
  Pid, 
  Name, 
  CommandLine, 
  Exe, 
  Username, 
  Ctime as CreationTime
FROM pslist()
WHERE Exe =~ '/tmp/' OR Exe =~ '/var/tmp/' OR Exe =~ '/dev/shm/'

SELECT 
  Family, 
  State, 
  RemoteAddress, 
  RemotePort, 
  Pid
FROM netstat()
WHERE State = 'ESTABLISHED' AND RemotePort IN (80, 443, 8080, 31337, 6667)

#!/bin/bash
# TuxBot v3 Response and IoT Hardening Script
# Run with root privileges

# 1. Identify and terminate suspicious processes in common botnet staging areas
echo "[*] Hunting for suspicious processes in /tmp, /var/tmp, and /dev/shm..."
for pid in $(ps aux | awk '/[/]tmp/|/dev/shm// {print $2}'); do
    echo "[!] Killing PID $pid located in temp directory"
    kill -9 $pid
done

# 2. Remove common persistence artifacts
echo "[*] Cleaning common botnet persistence files..."
rm -f /tmp/.tux* /tmp/.sh* /var/tmp/.tux* /dev/shm/.tux*
rm -f /etc/cron.d/* /var/spool/cron/crontabs/root.tmp

# 3. Disable Telnet (enforce SSH only)
echo "[*] Disabling Telnet to prevent future credential-based compromises..."
systemctl stop telnet.socket 2>/dev/null
systemctl disable telnet.socket 2>/dev/null

# 4. Firewall hardening - Block incoming connections on non-essential high ports often used for C2
# Note: Adjust rules based on legitimate business needs
echo "[*] Applying firewall restrictions..."
iptables -A INPUT -p tcp --dport 23 -j DROP  # Telnet
iptables -A INPUT -p tcp --dport 2323 -j DROP # Common exploited Telnet alt port
iptables -A INPUT -p tcp --dport 8080 -j DROP # Common HTTP alt port exploited by Mirai/TuxBot variants

# 5. Verify critical services
if systemctl is-active --quiet sshd; then
    echo "[+] SSHD is running."
else
    echo "[-] WARNING: SSHD is not running."
fi

echo "[*] Remediation actions complete. Please review logs for persistent unauthorized access."