Malicious FrostyNeighbor ViberPC Renamed Rundll32 DLL Execution

ATT&CK techniques

Defense Evasion

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
- T1036.005Match Legitimate Resource Name or Location
- T1218.011Rundll32
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects a rundll32 copy renamed to ViberPC.exe loading ViberPC.dll and invoking its SettingTimeAPI export, the execution chain used by the FrostyNeighbor PicassoLoader campaign. Renaming rundll32 and the payload to imitate the Viber messenger disguises DLL proxy execution as a trusted application.

Reporting behind it

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Malicious FrostyNeighbor ViberPC Renamed Rundll32 DLL Execution

Pivot detection · T1218.011 · 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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