Malicious RDP Reconnaissance with Valid Credentials Performed on Multiple Hosts (via security)
- Product
- windows
- Service
- security
- Author
- HuntRule
- Published
- 2026-05-30
- Updated
- 2026-08-28
ATT&CK techniques
Initial Access → Lateral MovementRecon
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 brutforce RDP services with compromised credentials via tools like Hydra. Note that this event will be reported only with valid user and password credentials, and it may be reported only when RDP session is fully opened (so not during reconnaisance phase) if NLA is disabled. For further correlation, ID 4624/4625 (logon type 3, 7 or 10) should be used.
Reporting behind it
- attack.mitre.orghttps://attack.mitre.org/techniques/T1078/
- attack.mitre.orghttps://attack.mitre.org/techniques/T1021/001/
- github.comhttps://github.com/mehranexpert/Crazy-RDP
- github.comhttps://github.com/3gstudent/SharpRDPCheck
- ponderthebits.comhttps://ponderthebits.com/2018/02/windows-rdp-related-event-logs-identification-tracking-and-investigation/
- purerds.orghttps://purerds.org/remote-desktop-security/auditing-remote-desktop-services-logon-failures-1/
- woshub.comhttp://woshub.com/rdp-connection-logs-forensics-windows/
- jpcertcc.github.iohttps://jpcertcc.github.io/ToolAnalysisResultSheet/details/mstsc.htm
- github.comhttps://github.com/AndrewRathbun/DFIRMindMaps/tree/main/OSArtifacts/Windows/RDP_Authentication_Artifacts
- github.comhttps://github.com/TonyPhipps/SIEM/blob/master/Notable-Event-IDs.md#microsoft-windows-remotedesktopservices-rdpcoretsoperational
- dfironthemountain.wordpress.comhttps://dfironthemountain.wordpress.com/2019/02/15/rdp-event-log-dfir/
- nullsec.ushttps://nullsec.us/windows-event-id-1029-hashes/
- 13cubed.comhttps://www.13cubed.com/downloads/rdp_flowchart.pdf
- nullsec.ushttps://nullsec.us/windows-rdp-related-event-logs-the-client-side-of-the-story/
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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