iphlpapi.dll File Write to Appdata_Local_Microsoft (Sysmon)

id: '32477.57725'
title: iphlpapi.dll File Write to Appdata_Local_Microsoft
description: Adversaries may execute their own malicious payloads by side-loading
  DLLs. Similar to DLL Search Order Hijacking, side-loading involves hijacking which
  DLL a program loads. But rather than just planting the DLL within the search order
  of a program then waiting for the victim application to be invoked, adversaries
  may directly side-load their payloads by planting then invoking a legitimate application
  that executes their payload(s). Researchers have reported that malicious documents
  can use DLL sideloading using Teams or OneDrive to establish C&C. This use case
  iphlpapi.dll file writes in a subfolder under the AppData\Local\Microsoft path,
  indicating potential abuse of Microsoft applications to sideload malicious DLLs.
logic_format: Splunk
logic: '`get_endpoint_data` `get_endpoint_data_sysmon` (TERM(EventCode=11) OR "<EventID>11<")
  "iphlpapi.dll" "\\AppData\\Local\\Microsoft" | regex TargetFilename="(?i)\x5cAppData\x5cLocal\x5cMicrosoft\x5c.*iphlpapi\.dll"
  | table _time, host, user, process, process_*, file_* | bin span=1s | stats values(*)
  as * by _time, host '
techniques:
- persistence:hijack execution flow:dll side-loading
technique_id:
- T1574.002
data_category:
- Windows Sysmon
references:
- https://attack.mitre.org/techniques/T1574/002/
- https://detection.fyi/sigmahq/sigma/windows/file/file_event/file_event_win_iphlpapi_dll_sideloading/
- https://cyble.com/blog/targeted-attacks-being-carried-out-via-dll-sideloading/