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Worm:Win32/Codbot

First posted on 28 September 2015.
Source: Microsoft

Aliases :

There are no other names known for Worm:Win32/Codbot.

Explanation :

Threat behavior

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

• %CommonProgramFiles%\system\msadc\msadcerr.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: "NETLib"
With data: "%CommonProgramFiles%\system\msadc\msadcerr.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.



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 one or more mutexes on your PC. For example:

• 173A3A3A-E731-4F53-ACBB-80D1FDA16B2B

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 1ed009ab557a6e3969dbbc1f495905893f7567cb.

Symptoms

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

• You see a file similar to:
  • %CommonProgramFiles%\system\msadc\msadcerr.exe
  • %ProgramData%\microsoft\network\downloader\qmgr0.dat
  • %ProgramData%\microsoft\network\downloader\qmgr1.dat

• You see registry modifications such as:
  
  • In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Run
    Sets value: "NETLib"
    With data: "%CommonProgramFiles%\system\msadc\msadcerr.exe"
    
    

• You see the following mutex:
  • 173A3A3A-E731-4F53-ACBB-80D1FDA16B2B
  • G{D19BAF17-7C87-467E-8D63-6C4B1C836373}

Last update 28 September 2015

 

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