RainyDay

MITRE ATT&CK: S0629 View on attack.mitre.org

Aliases: RainyDay

First seen
2020-01-01 00:00:00
Malware type
backdoor
Family
Malware family
Operating systems
windows
Profile updated
2026-07-07 14:45:00

Targeted industries: government-and-public-sector defense-and-aerospace

Targeted regions: country_code:cn country_code:ph country_code:my

Context

RainyDay is a backdoor tool that has been used by Naikon since at least 2020.

Detection coverage

  • 443 Sigma rules

Malware & tools used

  • Match Legitimate Resource Name or Location (attack-pattern)
  • Native API (attack-pattern)
  • File Deletion (attack-pattern)
  • Exfiltration to Cloud Storage (attack-pattern)
  • Ingress Tool Transfer (attack-pattern)
  • Deobfuscate/Decode Files or Information (attack-pattern)
  • Web Protocols (attack-pattern)
  • Masquerade Task or Service (attack-pattern)
  • System Service Discovery (attack-pattern)
  • Process Discovery (attack-pattern)
  • Local Data Staging (attack-pattern)
  • Credentials from Web Browsers (attack-pattern)
  • Encrypted/Encoded File (attack-pattern)
  • Fallback Channels (attack-pattern)
  • Windows Service (attack-pattern)
  • Windows Command Shell (attack-pattern)
  • Proxy (attack-pattern)
  • Screen Capture (attack-pattern)
  • File and Directory Discovery (attack-pattern)
  • Windows Credential Manager (attack-pattern)
  • Scheduled Task (attack-pattern)
  • Non-Application Layer Protocol (attack-pattern)
  • Symmetric Cryptography (attack-pattern)
  • DLL (attack-pattern)
  • Data from Local System (attack-pattern)

Used by threat actors

Reports & references

  • bitdefender.com — Bitdefender Pr Whitepaper Naikon Creat5397 En En (report)
  • MITRE ATT&CK — S0629 (report)

External references