Suspicious EAGERBEE Configuration File Created in Public User Directory via File Event

ATT&CK techniques

Defense Evasion

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
- T1036Masquerading
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects creation of an iconcache.mui file in the public user directory which the REF5961 EAGERBEE backdoor uses as its configuration store. The masqueraded cache filename in a world-writable directory is a defense evasion technique to hide malware configuration in plain sight.

Reporting behind it

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Suspicious EAGERBEE Configuration File Created in Public User Directory via File Event

Pivot detection · T1036 · 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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