Suspicious Silent Security Product Uninstaller Execution

ATT&CK techniques

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects an Inno Setup product uninstaller being launched with fully silent flags, a behavior observed in LemonDuck first-stage payloads that silently remove Malwarebytes and other security products via their unins000.exe with /verysilent. Running an uninstaller with no user interaction is a strong indicator of automated defense removal by malware.

Reporting behind it

Related detections9 linkedT1685 — drag to rearrange

Malicious Antivirus Removal via WMIC Product Uninstall

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Suspicious Microsoft Defender Exclusion Added for TEMP and PowerShell via Add-MpPreference

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Malicious Defender Tampering via Registry DisableRealtimeMonitoring

Suspicious SmartScreen Disable via Registry Modification via registry_set

Malicious Microsoft Defender Disable via Registry by Key Group

Suspicious Process Made Critical via RtlSetProcessIsCritical (via ps_script)

Malicious Defender Exclusion Added for User Profile Path

Suspicious Silent Security Product Uninstaller Execution

Pivot detection · T1685 · 9 related

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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