Malicious Exchange Mailbox Export to ASPX via New-MailboxExportRequest

ATT&CK techniques

Initial Access → Collection

Recon
Resource Dev
Initial Access
- T1190Exploit Public-Facing Application
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
- T1114.002Remote Email Collection
C2
Exfiltration
Impact

What it detects

This rule detects the Exchange management cmdlet New-MailboxExportRequest writing a mailbox export to an .aspx file, the technique used in the DatopLoader ProxyShell chain to drop a web shell onto the Exchange server. Exporting mailbox data to a web-accessible ASPX path is a hallmark of ProxyShell post-exploitation and web shell staging.

Reporting behind it

Related detections9 linkedT1190 — drag to rearrange

Suspicious PraisonAI Unauthenticated Config Endpoint Access via Webserver

Malicious Langflow Build Public Temp RCE Access via Webserver

Suspicious PraisonAI Vulnerability Scanner User Agent via Webserver

Malicious LiteLLM Authentication SQL Injection via Web Request (via webserver)

Possible Marimo Unauthenticated Terminal WebSocket Access via Web Request (via webserver)

Possible React2Shell Next.js Prototype Pollution Exploitation via Web Request (via webserver)

Malicious Marimo Notebook Credential File Access via Shell (via process_creation)

Malicious Ingress-nginx Configuration Injection via Kubernetes Audit (via kubernetes)

Malicious SharePoint ToolShell Post-Exploitation via Encoded PowerShell (via process_creation)

Malicious Exchange Mailbox Export to ASPX via New-MailboxExportRequest

Pivot detection · T1190 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

Full detection rule

Unlock this rule to view and copy it

The detection logic is included with a plan. Everything else — context, mappings and implementation details — stays free on this page.

Sign in for 3 free unlocks

Signing in gives you 3 unlocks to spend on any rule in the library. No card, and they do not expire.

Also included

Unlocked rules convert on this page — to Splunk SPL or Splunk — Raw Index SPL or Microsoft Sentinel KQL or Microsoft Sentinel ASIM ASIM KQL or Microsoft Defender XDR KQL or Elastic Security KQL or Elastic Security Lucene or Elastic Security ES|QL or CrowdStrike Falcon CQL or SentinelOne PowerQuery or Palo Alto Cortex XDR XQL or Carbon Black Cloud Platform Search or Carbon Black EDR Process Search or Google Security Operations UDM Search or IBM QRadar AQL or Sumo Logic Cloud SIEM Rules expression or Rapid7 InsightIDR LEQL or Graylog Search or OpenSearch Lucene or OpenSearch PPL PPL or Grafana Loki LogQL or SQLite SQL or Zircolite SQLite — with the log-source profile the engine picked, the field map it used, and everything it could not express. Converting a rule you have unlocked costs no further credit.

See it run on a free rule →Convert your own rule →