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Active Rule
Registry Modification for OCI DLL Redirection
Target Profile
Splunk
Splunk SPL & tstats data model queries
Format Mode
Default
Plain SPL queries
Conversion Output
Registry Modification for OCI DLL Redirection
Using Splunk · Default · sigma-cli 2.0.2
Translation controls
Adjust the rule on the left, then regenerate when you want a fresh backend-native query.
BackendSplunkFormatDefaultVersion2.0.2
title: Registry Modification for OCI DLL Redirection
id: c0e0bdec-3e3d-47aa-9974-05539c999c89
status: experimental
description: |
Detects registry modifications related to 'OracleOciLib' and 'OracleOciLibPath' under 'MSDTC' settings.
Threat actors may modify these registry keys to redirect the loading of 'oci.dll' to a malicious DLL, facilitating phantom DLL hijacking via the MSDTC service.
references:
- https://www.crowdstrike.com/en-us/blog/4-ways-adversaries-hijack-dlls/
author: Swachchhanda Shrawan Poudel (Nextron Systems)
date: 2026-01-24
tags:
- attack.persistence
- attack.privilege-escalation
- attack.defense-evasion
- attack.t1112
- attack.t1574.001
logsource:
category: registry_set
product: windows
detection:
selection_ocilib:
TargetObject|endswith: '\SOFTWARE\Microsoft\MSDTC\MTxOCI\OracleOciLib'
filter_main_ocilib_file:
# it is looking when oci.dll name is changed to something else like evil.dll
Details|contains: 'oci.dll'
selection_ocilibpath:
TargetObject|endswith: '\SOFTWARE\Microsoft\MSDTC\MTxOCI\OracleOciLibPath'
filter_main_ocilibpath:
# it is looking when oci.dll path is changed to something else like 'C:\Windows\Temp\'
Details|contains: '%SystemRoot%\System32\'
condition: (selection_ocilib and not filter_main_ocilib_file) or (selection_ocilibpath and not filter_main_ocilibpath)
falsepositives:
- Unlikely
level: high
CLI command
Copy the exact command to reproduce this translation locally.
sigma convert --without-pipeline -t splunk -f default rules/windows/registry/registry_set/registry_set_potential_oci_dll_redirection.yml