Phobos 8Base Ransomware Encrypted File Extension Created
- Product
- windows
- Category
- file_event
- Author
- HuntRule
- Published
- 2026-09-10
- Updated
- 2026-09-10
ATT&CK techniques
ImpactRecon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
What it detects
This rule detects files being renamed with the .8base extension appended by Phobos ransomware operated by the 8Base group. Phobos appends an extension containing a victim ID and contact email ending in .8base to each encrypted file. A wave of these file events signals active ransomware encryption on the host.
Reporting behind it
Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.
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Also included
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