Daserf

MITRE ATT&CK: S0187 View on attack.mitre.org

Aliases: Muirim, Nioupale, Daserf

First seen
2014-06-01 00:00:00
Malware type
backdoor, spyware
Family
Malware family
Operating systems
windows
Last IoC activity
2026-05-27 08:45:05
Profile updated
2026-07-07 15:45:25

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

Targeted regions: country_code:jp country_code:kr country_code:ru country_code:sg country_code:cn

Context

Daserf is a backdoor that has been used to spy on and steal from Japanese, South Korean, Russian, Singaporean, and Chinese victims. Researchers have identified versions written in both Visual C and Delphi.

Detection coverage

  • 1 YARA rules
  • 339 Sigma rules

Malware & tools used

  • Windows Command Shell (attack-pattern)
  • Code Signing (attack-pattern)
  • Ingress Tool Transfer (attack-pattern)
  • Software Packing (attack-pattern)
  • Standard Encoding (attack-pattern)
  • Archive via Utility (attack-pattern)
  • Screen Capture (attack-pattern)
  • Obfuscated Files or Information (attack-pattern)
  • Steganography (attack-pattern)
  • Symmetric Cryptography (attack-pattern)
  • Match Legitimate Resource Name or Location (attack-pattern)
  • Keylogging (attack-pattern)
  • Web Protocols (attack-pattern)
  • LSASS Memory (attack-pattern)
  • Archive Collected Data (attack-pattern)
  • Indicator Removal from Tools (attack-pattern)

Used by threat actors

Detection rules

  • MALPEDIA_Win_Daserf_Auto (yara-rule)

Reports & references

  • researchcenter.paloaltonetworks.com — Unit42 Tick Group Continues Attacks (report)
  • secureworks.com — Bronze Butler Targets Japanese Businesses (report)
  • secureworks.com — Bronze Butler (report)
  • Trend Micro — Redbaldknight Bronze Butler Daserf Backdoor Now Using Steganography (report)
  • malpedia.caad.fkie.fraunhofer.de — Win.Daserf (report)
  • MITRE ATT&CK — S0187 (report)

External references