Possible C2 via Google Sheets API Using Formula Render Option by GRIDTIDE
- Category
- proxy
- Author
- HuntRule
- Published
- 2026-10-13
- Updated
- 2026-10-13
ATT&CK techniques
C2 → ExfiltrationRecon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
Exfiltration
Impact
What it detects
This rule detects requests to the Google Sheets API using the valueRenderOption set to FORMULA which the GRIDTIDE backdoor abuses to read tasking hidden inside spreadsheet formulas. Attackers use this legitimate cloud service as a covert command and control and exfiltration channel.
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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