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Agent prompt: never run vssadmin or restore-point commands - #365
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Webroot treats a shadow-copy command run under MasterTech as ransomware and kills MasterTech. On DESKTOP-VRT0DTD it killed the client four times on 2026-10-09, each the moment an agent's restore-point check started vssadmin.exe. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Summary
Agents must not run
vssadmin,Checkpoint-Computeror any other restore-point or shadow-copy command, and they skip restore-point steps in procedures.Webroot sees a shadow-copy command in MasterTech's process tree as ransomware and kills MasterTech. MasterTech is unsigned and its hash changes with every release, so Webroot always runs it as an unknown, monitored program.
On DESKTOP-VRT0DTD (QC SO 2155035), MasterTech was killed four times on 2026-10-09, at 21:50, 22:32 and 23:57 UTC, and 00:05:59 UTC on 10-10. Each time,
C:\ProgramData\WRData\WRLog.loglogged:That line has the same timestamp, to the millisecond, as Webroot logging
vssadmin.exestarting from an agent's restore-point check. After the last kill the exe no longer launched.Related changes, already live
known_bad_driverfix text no longer includes the restore-point step.Test plan
machine_sessions_never_touch_shadow_copiestest.cargo test -p displays --lib --no-default-features --features tokio,wasm-plugins,native-telemetry🤖 Generated with Claude Code