huntrule

Windows regsvr32 DLLLoad from AppData Local containing DllEntry

Alerts when regsvr32 loads a DLL from AppData\Local with a DllEntry reference.

FreeReviewedSigma · Medium · v5
Product
windows
Category
process_creation
Author
Florian Roth (Nextron Systems), Tim Shelton, Nasreddine Bencherchali (Nextron Systems) (SigmaHQ), DRL 1.1
Published
2019-10-02
Updated
2026-07-31
AnalysisDetection

ATT&CK techniques

Defense Evasion

  1. Recon

  2. Resource Dev

  3. Initial Access

  4. Execution

  5. Persistence

  6. Priv Esc

  7. Defense Evasion

  8. Cred Access

  9. Discovery

  10. Lateral Movement

  11. Collection

  12. C2

  13. Exfiltration

  14. Impact

What it detects

This rule flags Windows process creation where regsvr32 is invoked with a DLL path under \AppData\Local\ and command-line content that includes .dll and DllEntry. Such usage can indicate an attempt to load a DLL through a signed binary to execute code or stage payloads while blending into normal system behaviors. It relies on process creation telemetry, matching the command line for regsvr32 and the expected DLL-related substrings.

Reporting behind it

Related detections9 linkedT1218.010 — drag to rearrange
Suspicious Regsvr32 Execution of SafePay Loader DLL
Suspicious Scheduled Task Running Regsvr32 with Extreme Duration by StaryDobry
Malicious DynamicWrapperX Registration via regsvr32 (via process_creation)
Suspicious Run Key Persistence Executing regsvr32
Suspicious regsvr32 Registering DLL from User AppData
Malicious Regsvr32 Loading Masqueraded VPN DLL via Process Creation
Malicious Regsvr32 ShellExec_RunDLL Proxy Execution (via process_creation)
Suspicious DLL Execution via Regsvr32 DllInstall of dat File
Malicious Xctdoor XcLoader Execution via Regsvr32 AppX Path Abuse (via process_creation)
Windows regsvr32 DLLLoad from AppData Local containing DllEntry
Pivot detection · T1218.010 · 9 related

Changelog

v5
  1. v5
    Candidate ingested via manual entry.2026-07-31
  2. v4
    Candidate ingested via manual entry.2026-07-31
  3. v3
    Candidate ingested via manual entry.2026-07-31
  4. v2
    Candidate ingested via manual entry.2026-07-31
  5. v1
    No changelog recorded for this version.2026-07-30

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