LoFP LoFP / although unlikely, some legitimate applications may leverage one of the following dlls syssetup.dll, dvpack.dll, ieadvpack.dll and can trigger a false positive. apply additional filters as needed.

Techniques

Sample rules

Windows Application Whitelisting Bypass Attempt via Rundll32

Description

The following analytic detects the execution of rundll32.exe calling one of the following DLLs:

with one of the following functions: “LaunchINFSection”, “InstallHinfSection”, “SetupInfObjectInstallAction”. This method is identified through Endpoint Detection and Response (EDR) telemetry, focusing on command-line executions and process details. This activity is significant as it indicates a potential application control or whitelisting bypass, allowing script code execution from a file. If confirmed malicious, an attacker could execute arbitrary code, potentially leading to privilege escalation, persistence, or further network compromise. Investigate the script content, network connections, and any spawned child processes for further context.

Detection logic


| tstats `security_content_summariesonly` 
  count min(_time) as firstTime 
  max(_time) as lastTime 
from datamodel=Endpoint.Processes where 
`process_rundll32` 
Processes.process IN ("*syssetup*", "*advpack*", "*setupapi*")
Processes.process IN ("*LaunchINFSection*", "*InstallHinfSection*", "*SetupInfObjectInstallAction*")
by Processes.action Processes.dest Processes.original_file_name Processes.parent_process
   Processes.parent_process_exec Processes.parent_process_guid Processes.parent_process_id
   Processes.parent_process_name Processes.parent_process_path Processes.process Processes.process_exec
   Processes.process_guid Processes.process_hash Processes.process_id Processes.process_integrity_level
   Processes.process_name Processes.process_path Processes.user Processes.user_id Processes.vendor_product

| `drop_dm_object_name(Processes)` 

| `security_content_ctime(firstTime)` 

| `security_content_ctime(lastTime)`

| `windows_application_whitelisting_bypass_attempt_via_rundll32_filter`