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PWS:MSIL/Petun

First posted on 16 October 2015.
Source: Microsoft

Aliases :

There are no other names known for PWS:MSIL/Petun.

Explanation :

Threat behavior

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

• %APPDATA%\mscchonfig.exe
• %APPDATA%\microsoft\system\services\18.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: "(default)"
With data: "%APPDATA%\mscchonfig.exe"
In subkey: HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Sets value: "18.exe"
With data: "%APPDATA%microsoft\system\services\18.exe"
In subkey: HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Sets value: "18.exe"
With data: "%APPDATA%microsoft\system\services\18.exe"


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



Payload


Steals your sensitive information

This threat can steal your sensitive information, such as your user names and passwords for:

• Email or social media websites
• Banking websites
• Online games

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:

• \...\Installing
• baeQJQuHHX
• LOADPERF_MUTEX

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 37aa2d8cc67b5acf90f64999e037b395c3037eff.

Symptoms

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

• You see a file similar to:
• %APPDATA%\mscchonfig.exe
• %APPDATA%microsoft\system\services\18.ex
  
• You see registry modifications such as:
• In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Run
  Sets value: "(default)"
  With data: "%APPDATA%\mscchonfig.exe"
  
  
• In subkey: HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
  Sets value: "18.exe"
  With data: "%APPDATA%microsoft\system\services\18.exe"
  
  
• In subkey: HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
  Sets value: "18.exe"
  With data: "%APPDATA%microsoft\system\services\18.exe"
  
  
• You see the following mutex:
  • \...\Installing
  • baeQJQuHHX
  • LOADPERF_MUTEX

Last update 16 October 2015

 

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