Sigma rule: Exploitation Activity of CVE-2025-59287 - WSUS Deserialization

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-152878c206b5, updated 2025-10-31T00:00:00.000Z.

Rule

Title
Exploitation Activity of CVE-2025-59287 - WSUS Deserialization
Status
experimental
Level
high
Author
Swachchhanda Shrawan Poudel (Nextron Systems)
Date
2025-10-31
File
rules-emerging-threats/2025/Exploits/CVE-2025-59287/win_wsus_exploit_cve_2025_59287.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects cast exceptions in Windows Server Update Services (WSUS) application logs that highly indicate exploitation attempts of CVE-2025-59287, a deserialization vulnerability in WSUS.

Log source

product
windows
service
application

Detection

selection:
    Provider_Name: 'Windows Server Update Services'
    EventID: 7053
    Data|contains|all:
       # Indicators of untrusted deserialization exploitation attempts
       # https://github.com/pwntester/ysoserial.net/issues/114
        - 'System.InvalidCastException'
        - 'System.Windows.Data.ObjectDataProvider'
        - 'Unable to cast object of type'
        - 'System.Windows.Media.Brush'
condition: selection

False positives (as the rule lists them)

  • Legitimate WSUS operations that may trigger similar error messages

Tags

  • attack.execution
  • attack.initial-access
  • attack.t1190
  • attack.t1203
  • cve.2025-59287
  • detection.emerging-threats

CVEs this rule names

MITRE ATT&CK ids this rule names

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-2025-59287/win_wsus_exploit_cve_2025_59287.yml

Sources and licences

  • SigmaHQ

    "Exploitation Activity of CVE-2025-59287 - WSUS Deserialization" by Swachchhanda Shrawan Poudel (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2025/Exploits/CVE-2025-59287/win_wsus_exploit_cve_2025_59287.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: Exploitation Activity of CVE-2025-59287 - WSUS Deserialization",
entity page, dataset version ref-152878c206b5, updated 2025-10-31T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/e5f66e87-7d6b-404f-92fe-7aa67814b5cd (accessed 2026-11-03).
Underlying source: SigmaHQ rule e5f66e87-7d6b-404f-92fe-7aa67814b5cd, 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.