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Description

This analytic identifies the suspicious Remote Thread execution of rundll32.exe process to cmd.exe process. This technique was seen in IcedID malware to execute its malicious code in normal process for defense evasion and to steal sensitive information the the compromised host. browser process.

  • Type: TTP
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel: Endpoint
  • Last Updated: 2021-07-29
  • Author: Teoderick Contreras, Splunk
  • ID: 2dbeee3a-f067-11eb-96c0-acde48001122

ATT&CK

ID Technique Tactic
T1055 Process Injection Defense Evasion, Privilege Escalation
`sysmon` EventCode=8 SourceImage = "*\\rundll32.exe" TargetImage = "*.exe" 
| stats count min(_time) as firstTime max(_time) as lastTime by SourceImage TargetImage TargetProcessId SourceProcessId StartAddress EventCode Computer 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `rundll32_create_remote_thread_to_a_process_filter`

Associated Analytic Story

How To Implement

To successfully implement this search, you need to be ingesting logs with the SourceImage, TargetImage, and EventCode executions from your endpoints related to create remote thread or injecting codes. If you are using Sysmon, you must have at least version 6.0.4 of the Sysmon TA.

Required field

  • _time
  • SourceImage
  • TargetImage
  • TargetProcessId
  • SourceProcessId
  • StartAddress
  • EventCode
  • Computer

Kill Chain Phase

  • Exploitation

Known False Positives

unknown

RBA

Risk Score Impact Confidence Message
56.0 70 80 rundl32 process $SourceImage$ create a remote thread to process $TargetImage$ in host $Computer$

Reference

Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

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