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Worm:Win32/Ainslot.P

First posted on 29 October 2014.
Source: Microsoft

Aliases :

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

Explanation :

Threat behavior

Installation

Worm:Win32/Ainslot.P copies itself to \sys32\systemupdate.exe. The malware changes the following registry entries so that it runs each time you start your PC:

Sets value: "Userinit"
With data: "c:\windows\system32\userinit.exe,c:\windows\system32\sys32\systemupdate.exe"
In subkey: HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon The malware uses code injection to make it harder to detect and remove. It can inject code into running processes, including the following:

• notepad.exe

Payload

Changes system security settings

Worm:Win32/Ainslot.P might try to disable antivirus notifications from the Windows Security Center by modifying the following registry entry:

Sets value: "AntiVirusDisableNotify"
With data: "1"
In subkey: HKLM\SOFTWARE\Microsoft\Security Center Contacts remote host

The malware might contact a remote host at dofusaccounts12.no-ip.biz using port 1604. Commonly, malware does this to:

• Report a new infection to its author
• Receive configuration or other data
• Download and run files, including updates or other malware
• Receive instructions from a remote hacker
• Upload data taken from your PC

This malware description was produced and published using automated analysis of file SHA1 abed9bcc82a7abf5592fd6cad831abd2c0080767.Symptoms

System changes

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

• You have these files:
  
  \sys32\systemupdate.exe

• You see these entries or keys in your registry:
  
  Sets value: "Userinit"
  With data: "c:\windows\system32\userinit.exe,c:\windows\system32\sys32\systemupdate.exe"
  In subkey: HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
  
  Sets value: "AntiVirusDisableNotify"
  With data: "1"
  In subkey: HKLM\SOFTWARE\Microsoft\Security Center

Last update 29 October 2014

 

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