CALENDAR
MITRE ATT&CK: S0025 View on attack.mitre.org
Aliases: CALENDAR
- First seen
- 2013-01-01 00:00:00
- Malware type
- backdoor
- Family
- Malware family
- Operating systems
- windows
- Related IoCs
- 1
- Last IoC activity
- 2026-03-03 18:14:44
- Profile updated
- 2026-07-07 12:34:49
Targeted industries: government-and-public-sector technology-and-telecommunications
Targeted regions: country_code:us country_code:cn
Context
CALENDAR is malware used by APT1 that mimics legitimate Gmail Calendar traffic.
Detection coverage
- 30 Sigma rules
Malware & tools used
- Windows Command Shell (attack-pattern)
- Bidirectional Communication (attack-pattern)
Used by threat actors
- APT1 (threat-actor)
- TOUGHPROGRESS Campaign (campaign)
Reports & references
- Mandiant — Mandiant Apt1 Report (report)
- MITRE ATT&CK — S0025 (report)