IMAPLoader

MITRE ATT&CK: S1152 View on attack.mitre.org

Aliases: IMAPLoader

First seen
2022-01-01 00:00:00
Malware type
loader
Family
Malware family
Operating systems
windows
Profile updated
2026-07-07 12:57:08

Targeted industries: government-and-public-sector financial-services

Context

IMAPLoader is a .NET-based loader malware exclusively associated with CURIUM operations since at least 2022. IMAPLoader leverages email protocols for command and control and payload delivery.

Detection coverage

  • 1 YARA rules
  • 207 Sigma rules

Malware & tools used

  • Create or Modify System Process (attack-pattern)
  • Native API (attack-pattern)
  • Windows Management Instrumentation (attack-pattern)
  • System Information Discovery (attack-pattern)
  • Hidden Window (attack-pattern)
  • AppDomainManager (attack-pattern)
  • Mail Protocols (attack-pattern)
  • Ingress Tool Transfer (attack-pattern)
  • Scheduled Task (attack-pattern)

Used by threat actors

Detection rules

  • SEKOIA_Apt_Tortoiseshell_Imaploader (yara-rule)

Reports & references

  • pwc.com — Yellow Liderc Ships Its Scripts Delivers Imaploader Malware (report)
  • malpedia.caad.fkie.fraunhofer.de — Win.Imap Loader (report)
  • CrowdStrike — Imperial Kitten Deploys Novel Malware Families (report)
  • MITRE ATT&CK — S1152 (report)

External references