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Backdoor:Win32/Slingup.A

First posted on 16 October 2015.
Source: Microsoft

Aliases :

There are no other names known for Backdoor:Win32/Slingup.A.

Explanation :

Threat behavior

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

• %TEMP%\spoolsv.exe
• \wordpad.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: "spoolsv"
With data: "c:\users\admini~1\appdata\local\temp\spoolsv.exe"

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



Payload


Allows backdoor access and control

This threat can give a malicious hacker access and control of your PC. They can then perform a number of different actions, such as:

• Deleting files
• Downloading and running files
• Logging your keystrokes or stealing your sensitive data
• Modifying your system settings
• Running or stopping applications
• Spreading malware to other PCs
• Uploading files

Modifies system settings
This threat can make changes to the way your PC behaves. It can:

• Stop alerts when programs try to make changes to your PC
• Disable tools for editing the registry

Connects to a remote host

We have seen this threat connect to a remote host, including:

• www.biteskillerr.net using port 53

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

Additional information

Creates a mutex

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

• q1w2e3r4t5z600%

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 3b34f7da0a6c68b3ad98148fb0b8aa6109997429.

Symptoms

The following can indicate that you have this threat on your PC:

• You see a file similar to:
  • %TEMP%\spoolsv.exe
  • \wordpad.exe

• You see registry modifications such as:
  
  • In subkey: HKCU\software\microsoft\windows\currentversion\policies\system
    Sets value: "disableregistrytools"
    With data: "0x00000001"
    
    
  • In subkey: HKCU\software\microsoft\windows\currentversion\run
    Sets value: "spoolsv"
    With data: "c:\users\admini~1\appdata\local\temp\spoolsv.exe"
    
    
  • In subkey: HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System
    Sets value: "EnableLUA"
    With data: "0x00000000"
    
    
  • In subkey: HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System
    Sets value: "EnableLUA"
    With data: "0x00000000"
    
    

• You see the following mutex:
  • q1w2e3r4t5z600%

Last update 16 October 2015

 

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