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Backdoor:PHP/Shell.O
Updated on Jul 05, 2013
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.
Alert level:
severe