FoggyWeb

MITRE ATT&CK: S0661 View on attack.mitre.org

Aliases: FoggyWeb

First seen
2021-04-01 00:00:00
Malware type
backdoor
Family
Malware family
Operating systems
windows
Profile updated
2026-07-07 15:30:30

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

Targeted regions: country_code:us country_code:gb country_code:ca country_code:au

Context

FoggyWeb is a passive and highly-targeted backdoor capable of remotely exfiltrating sensitive information from a compromised Active Directory Federated Services (AD FS) server. It has been used by APT29 since at least early April 2021.

Detection coverage

  • 328 Sigma rules

Malware & tools used

  • Deobfuscate/Decode Files or Information (attack-pattern)
  • Archive via Custom Method (attack-pattern)
  • Exfiltration Over C2 Channel (attack-pattern)
  • Compile After Delivery (attack-pattern)
  • Data from Local System (attack-pattern)
  • Encrypted/Encoded File (attack-pattern)
  • Web Protocols (attack-pattern)
  • Private Keys (attack-pattern)
  • Masquerading (attack-pattern)
  • Process Discovery (attack-pattern)
  • Use Alternate Authentication Material (attack-pattern)
  • Native API (attack-pattern)
  • Shared Modules (attack-pattern)
  • Network Sniffing (attack-pattern)
  • Archive via Library (attack-pattern)
  • Ingress Tool Transfer (attack-pattern)
  • DLL (attack-pattern)
  • Match Legitimate Resource Name or Location (attack-pattern)
  • File and Directory Discovery (attack-pattern)
  • Reflective Code Loading (attack-pattern)
  • Symmetric Cryptography (attack-pattern)

Used by threat actors

Reports & references

  • MITRE ATT&CK — S0661 (report)
  • Microsoft — Foggyweb Targeted Nobelium Malware Leads To Persistent Backdoor (report)

External references