Malicious Renamed Rundll32 Copied to Temp via Xcopy

ATT&CK techniques

Defense Evasion

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
- T1218.011Rundll32
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects xcopy copying the legitimate rundll32.exe binary into a user temp directory under a renamed filename as seen in the HTML smuggling IcedID intrusion that led to domain wide ransomware where the actor proxied execution of a malicious DLL through a renamed system binary and this matters because a renamed signed loader staged in temp is a strong indicator of defense evasion and hands on keyboard staging.

Reporting behind it

Related detections9 linkedT1218.011 — drag to rearrange

Suspicious Scheduled Task Executing Rundll32 DLL Export by Ordinal

Suspicious rundll32 Executing DLL from ProgramData (via process_creation)

Suspicious Rundll32 Loading DLL From Public or ProgramData Path via Process Creation (via process_creation)

Malicious LSASS Credential Dump via Rundll32 Comsvcs MiniDump via Process Creation (via process_creation)

Suspicious Rundll32 Execution Without a DLL Reference via Process Creation (via process_creation)

Suspicious WebDAV Retrieval via rundll32 and davclnt.dll (via process_creation)

Suspicious Rundll32 Execution with Latrodectus Loader Exports (via process_creation)

Suspicious Rundll32 Execution with IcedID Loader Export (via process_creation)

Malicious Scheduled Task Running rundll32 w32analytics (via process_creation)

Malicious Renamed Rundll32 Copied to Temp via Xcopy

Pivot detection · T1218.011 · 9 related

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