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Worm:VBS/Asept.B!bit


First posted on 13 September 2016.
Source: Microsoft

Aliases :

There are no other names known for Worm:VBS/Asept.B!bit.

Explanation :

Installation
This threat can create files on your PC, including:

  • %LOCALAPPDATA%\tempwinlogon.exe
  • %TEMP%\server.exe


It modifies the registry so that it runs each time you start your PC. For example:

In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Sets value: "49242902c368a4d9a3743cc453d2c019"
With data: ""%TEMP%\server.exe" .."
In subkey: HKLM\Software\Microsoft\Windows\CurrentVersion\Run
Sets value: "49242902c368a4d9a3743cc453d2c019"
With data: ""%TEMP%\server.exe" .."

The malware uses code injection to make it harder to detect and remove. It can inject code into running processes.

Payload

Connects to a remote host

We have seen this threat connect to a remote host, including:
  • orox.zapto.org using port 1177
Malware can connect to a remote host to do any of the following:
  • Check for an Internet connection
  • Download and run files (including updates or other malware)
  • Report a new infection to its author
  • Receive configuration or other data
  • Receive instructions from a malicious hacker
  • Search for your PC location
  • Upload information taken from your PC
  • Validate a digital certificate


Bypasses firewall

This threat can modify, bypass, or disable your firewall. It can do this by changing your firewall settings, or by adding a new rule so that it, or other applications, aren't detected.

You might need to restore your Windows Firewall settings.

Additional information

Creates a mutex

This threat can create a mutex on your PC. For example:
  • 49242902c368a4d9a3743cc453d2c019


It might use this mutex as an infection marker to prevent more than one copy of the threat running on your PC.

This malware description was published using automated analysis of file SHA1 ec5df0a9f5514832e4ae003c75215e3f3f5eb7f8.

Last update 13 September 2016

 

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