Windows Defender deletes Citrix components mislabeled as malware

CyberTech

Level 44
Thread author
Verified
Top Poster
Well-known
Nov 10, 2017
3,247
hGkgOTP.jpeg

Citrix released an advisory on Thursday about troublesome Windows Defender definition updates that break Delivery Controllers and Cloud Connectors running Microsoft’s antivirus.

The issue is due to Windows Defender misidentifying as malicious and quarantining the main and secondary Citrix broker services (BrokerService.exe and HighAvailabilityService.exe) responsible for tracking current user connections/sessions.

Both files were erroneously detected as the information-stealing malware Agent Tesla and sent to isolation.

On Thursday, several Citrix system administrators reported that the broker service on Delivery Controllers was failing. Problems started with Windows Defender definition 1.321.1319.0.

The trouble persisted in subsequent updates delivered over more than seven hours until Microsoft pushed Antivirus definition 1.321.1341.0 that corrected the issue.

 

About us

  • MalwareTips is a community-driven platform providing the latest information and resources on malware and cyber threats. Our team of experienced professionals and passionate volunteers work to keep the internet safe and secure. We provide accurate, up-to-date information and strive to build a strong and supportive community dedicated to cybersecurity.

User Menu

Follow us

Follow us on Facebook or Twitter to know first about the latest cybersecurity incidents and malware threats.

Top