Suspicious PowerShell Download of updserc Archive to AppData via ClickFix

ATT&CK techniques

Initial Access → Execution

Recon
Resource Dev
Initial Access
- T1566Phishing
Execution
- T1059.001PowerShell
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects PowerShell downloading an archive named updserc.zip into the local AppData directory. This activity is part of a ClickFix phishing chain abusing Booking.com themed lures to stage the PureRAT loader. Pulling a named archive into AppData through PowerShell is an early loader step that precedes DLL side-loading and in-memory execution.

Reporting behind it

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Suspicious PowerShell Download of updserc Archive to AppData via ClickFix

Pivot detection · T1059.001 · 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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