Sigma rule: Potential Exploitation of RCE Vulnerability CVE-2025-33053 - Process Access

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-a1ee65006cf8, updated 2025-06-13T00:00:00.000Z.

Rule

Title
Potential Exploitation of RCE Vulnerability CVE-2025-33053 - Process Access
Status
experimental
Level
high
Author
Swachchhanda Shrawan Poudel (Nextron Systems)
Date
2025-06-13
File
rules-emerging-threats/2025/Exploits/CVE-2025-33053/proc_access_win_exploit_cve_2025_33053.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects potential exploitation of remote code execution vulnerability CVE-2025-33053
by looking for process access that involves legitimate Windows executables (iediagcmd.exe, CustomShellHost.exe)
accessing suspicious executables hosted on WebDAV shares. This indicates an attacker may be exploiting
Process.Start() search order manipulation to execute malicious code from attacker-controlled WebDAV servers
instead of legitimate system binaries. The vulnerability allows unauthorized code execution through
external control of file names or paths via WebDAV.

Log source

product
windows
category
process_access

Detection

selection_src:
    SourceImage:
        - 'C:\Program Files\internet explorer\iediagcmd.exe'
        - 'C:\Windows\System32\CustomShellHost.exe'
selection_target_dir:
    - TargetImage|startswith: '\\\\'
    - TargetImage|contains: '\DavWWWRoot\'
selection_target_exe:
    TargetImage|endswith:
        - '\route.exe'
        - '\netsh.exe'
        - '\makecab.exe'
        - '\dxdiag.exe'
        - '\ipconfig.exe'
        - '\explorer.exe'
condition: all of selection_*

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.command-and-control
  • attack.execution
  • attack.stealth
  • attack.t1218
  • attack.lateral-movement
  • attack.t1105
  • detection.emerging-threats
  • cve.2025-33053

CVEs this rule names

MITRE ATT&CK ids this rule names

Related rules

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2025/Exploits/CVE-2025-33053/proc_access_win_exploit_cve_2025_33053.yml

Sources and licences

  • SigmaHQ

    "Potential Exploitation of RCE Vulnerability CVE-2025-33053 - Process Access" by Swachchhanda Shrawan Poudel (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2025/Exploits/CVE-2025-33053/proc_access_win_exploit_cve_2025_33053.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Potential Exploitation of RCE Vulnerability CVE-2025-33053 - Process Access",
entity page, dataset version ref-a1ee65006cf8, updated 2025-06-13T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/9a2d8b3e-f5a1-4c68-9e21-7d9e1cf8a123 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 9a2d8b3e-f5a1-4c68-9e21-7d9e1cf8a123, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.