Suspicious Outlook Security Manager DLL Load for Mail Harvesting (via image_load)
- Product
- windows
- Category
- image_load
- Author
- HuntRule
- Published
- 2026-06-26
- Updated
- 2026-08-28
ATT&CK techniques
CollectionRecon
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 the Grandoreiro banking trojan loading the secman or secman64 Outlook Security Manager component to iterate mailbox folders and harvest addresses for spam propagation. These third-party COM libraries are rarely present on standard endpoints. Their appearance alongside Outlook automation indicates mailbox collection.
Reporting behind it
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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