CASTLETAP

MITRE ATT&CK: S1224 View on attack.mitre.org

Aliases: CASTLETAP

First seen
2022-09-15 00:00:00
Malware type
backdoor
Family
Malware family
Operating systems
network-devices
Profile updated
2026-07-07 13:05:58

Targeted industries: government-and-public-sector technology-and-telecommunications

Context

CASTLETAP is an ICMP port knocking backdoor that has been installed on compromised FortiGate firewalls by UNC3886.

Detection coverage

  • 120 Sigma rules

Malware & tools used

  • Unix Shell (attack-pattern)
  • Socket Filters (attack-pattern)
  • Ingress Tool Transfer (attack-pattern)
  • Deobfuscate/Decode Files or Information (attack-pattern)
  • Asymmetric Cryptography (attack-pattern)
  • Network Sniffing (attack-pattern)
  • Symmetric Cryptography (attack-pattern)
  • Data from Local System (attack-pattern)

Used by threat actors

Reports & references

  • Mandiant — Fortinet Malware Ecosystem (report)
  • MITRE ATT&CK — S1224 (report)

External references