Potential PrintNightmare Exploitation Attempt

    Date: 09/16/2024

    Severity: Medium

    Summary

    The "PrintNightmare" vulnerability refers to a critical security flaw in the Windows Print Spooler service, discovered in mid-2021. This vulnerability, tracked as CVE-2021-34527, allows attackers to execute arbitrary code with system privileges, potentially leading to full system compromise. It affects various versions of Windows and can be exploited remotely, making it particularly dangerous. Microsoft released patches to address the issue, but it remains a significant concern for IT security professionals due to its potential for exploitation and the complexity involved in fully securing affected systems.

    Indicators of Compromise (IOC) List

    Image

    '\spoolsv.exe'

    TargetFilename

    'C:\Windows\System32\spool\drivers\x64\3\'

    Gurucul Threat Detection and Incident Response (TDIR) Queries for Detection

    Detection Query 1

    ((resourcename in ("Sysmon") AND eventtype = "23") AND image = "\spoolsv.exe") AND targetfilename = "C:\Windows\System32\spool\drivers\x64\3\"

    Detection Query 2

    ((technologygroup = "EDR") AND image = "\spoolsv.exe") AND targetfilename = "C:\Windows\System32\spool\drivers\x64\3\"

    Reference: 

    https://github.com/SigmaHQ/sigma/blob/master/rules/windows/file/file_delete/file_delete_win_cve_2021_1675_print_nightmare.yml


    Tags

    SigmaExploit

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