Backdoor:JS/SimChocexShell.A!dha

Guidance for individual users

For more tips on how to keep your device safe, go to the Microsoft security help & learning portal.

To learn more about preventing trojans or other malware from affecting individual devices, read about preventing malware infection.

Guidance for enterprise administrators and Microsoft 365 Defender customers

Apply these mitigations to reduce the impact of this threat. Check the recommendations card for the deployment status of monitored mitigations.

• Turn on cloud-delivered protection in Microsoft Defender Antivirus or the equivalent for your antivirus product to cover rapidly evolving attacker tools and techniques. Cloud-based machine learning protections block a huge majority of new and unknown variants.
• Turn on tamper protection features to prevent attackers from stopping security services.
• Run EDR in block mode so that Microsoft Defender for Endpoint can block malicious artifacts, even when your non-Microsoft antivirus doesn’t detect the threat or when Microsoft Defender Antivirus is running in passive mode. EDR in block mode works behind the scenes to remediate malicious artifacts that are detected post-breach.
• Enable network protection to prevent applications or users from accessing malicious domains and other malicious content on the internet.
• Enable investigation and remediation in full automated mode to allow Microsoft Defender for Endpoint to take immediate action on alerts to resolve breaches, significantly reducing alert volume.

Use device discovery to increase your visibility into your network by finding unmanaged devices on your network and onboarding them to Microsoft Defender for Endpoint.