Backdoor.Win64.OYSTER.C

This Backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It does not have any propagation routine.

It connects to a website to send and receive information. It does not have any backdoor routine.

It deletes itself after execution.

However, as of this writing, the said sites are inaccessible.

Arrival Details

This Backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Backdoor adds the following processes:

• schtasks.exe /Create /SC MINUTE /TN GoogleUpdateTask /TR \"cmd.exe /C del \\"%s\\" && schtasks.exe /Delete /TN GoogleUpdateTask /F\" /F → Deletes itself and created scheduled task
• "cmd.exe /C ping 1.1.1.1 -n 1 -w 3000 > Nul & Del /f /q \"%s\""

Propagation

This Backdoor does not have any propagation routine.

Backdoor Routine

This Backdoor connects to the following websites to send and receive information:

• {BLOCKED}.{BLOCKED}.199.85

It does not have any backdoor routine.

Rootkit Capabilities

This Backdoor does not have rootkit capabilities.

Adware Routine

This Backdoor deletes itself after execution.

Information Theft

This Backdoor gathers the following data:

• Username
• Hostname

Other Details

This Backdoor does the following:

• It terminates itself if it checks that it is being debugged.

However, as of this writing, the said sites are inaccessible.

It does not exploit any vulnerability.