Trojan:Win64/IcedId

Guidance for end users

Prevent IcedID attacks from getting into your network by avoiding opening files from unknown sources, especially if they arrived through email.

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

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

Initial access

• Educate end users about protecting personal and business information in social media, filtering unsolicited communication, identifying lures in spear-phishing emails and watering holes, and reporting reconnaissance attempts and other suspicious activity.
• Encourage users to use Microsoft Edge and other web browsers that support SmartScreen, which identifies and blocks malicious websites, including phishing sites, scam sites, and sites that contain exploits and host malware. Turn on network protection to block connections to malicious domains and IP addresses.

Security controls

• Turn on cloud-delivered protection and automatic sample submission on Microsoft Defender Antivirus. These capabilities use artificial intelligence and machine learning to quickly identify and stop new and unknown threats.
• Turn on attack surface reduction rules, including rules that block malware activity and other activities associated with human adversaries. To assess the impact of these rules, deploy them in audit mode.
• Use Microsoft Defender for Office 365 for enhanced phishing protection and coverage against new threats and polymorphic variants. Defender for Office 365 customers should ensure that Safe Links protection is enabled for users with Zero-hour Auto Purge (ZAP) to remove emails when a URL gets weaponized post-delivery.
• Turn on tamper protection features to prevent attackers from stopping security services.
• Ensure internet-facing assets have the latest security updates. Audit these assets regularly for suspicious activity.
• Follow standard guidance for macro security in the security baselines for Office and Office 365 and the Windows security baselines.