We're gradually updating threat actor names in our reports to align with the new weather-themed taxonomy. Learn about Microsoft threat actor names
Backdoor:PHP/Shell.O
Aliases: No associated aliases
Summary
Microsoft Defender Antivirus detects and removes this threat.
The threat is a backdoor trojan that allows a remote attacker access and control of a Linux-based PHP web server.
Threats such as this one (also known as a backdoor shell) are typically installed on a PC that has already been infected by a malicious hacker. The presence of this threat indicates that the machine (and associated web servers) have been compromised.
You should perform a full clean and change all usernames and passwords for the machine and associated web servers.
Use the following free Microsoft software to detect and remove this threat:
- Microsoft Defender Antivirus for Windows 10 and Windows 8.1, or Microsoft Security Essentials for Windows 7 and Windows Vista
- Microsoft Safety Scanner
You should also run a full scan. A full scan might find hidden malware.
Protect your sensitive information
This threat tries to steal your sensitive and confidential information. If you think your information has been stolen, see:
You should change your passwords after you've removed this threat:
Get more help
You can also visit our advanced troubleshooting page or search the Microsoft virus and malware community for more help.
If you’re using Windows XP, see our Windows XP end of support page.
