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InformationalSplunk security contentTeoderick Contreras +2

Windows Uncommon Remote Thread Creation In Browser Process

The following analytic identifies the creation of a remote thread by a process such as wermgr.exe or rundll32.exe into a browser process such as firefox.exe, chrome.exe, and others. These processes do not typically…

Description

The following analytic identifies the creation of a remote thread by a process such as wermgr.exe or rundll32.exe into a browser process such as firefox.exe, chrome.exe, and others. These processes do not typically create remote threads, in browser processes. It leverages Sysmon EventID 8 to detect this behavior by monitoring SourceImage and TargetImage fields. This activity is significant because it is commonly associated with malware like Qakbot and IcedID, which injects malicious code into legitimate processes to steal information. If confirmed malicious, this activity could allow attackers to execute arbitrary code, escalate privileges, and exfiltrate sensitive data from the compromised host.

Detection logic

Detection requirements

Platform
Windows

The rule states no platform. This is derived from the ATT&CK technique it maps to.

Log source category
sysmon_eventid_8

Known benign triggers

  • No false positives have been identified at this time.

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