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TrojanDropper:MSIL/Hostwack.A

First posted on 13 October 2015.
Source: Microsoft

Aliases :

There are no other names known for TrojanDropper:MSIL/Hostwack.A.

Explanation :

Threat behavior

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

• %APPDATA%\ping.exe
• %TEMP%\encryptado.exe
• \abe20d48fadb3534dbee98d77de97e0d.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: "abe20d48fadb3534dbee98d77de97e0d"
With data: ""%APPDATA%\ping.exe" .."
In subkey: HKLM\Software\Microsoft\Windows\CurrentVersion\Run Sets value: "abe20d48fadb3534dbee98d77de97e0d"
With data: ""%APPDATA%\ping.exe" .."

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



Payload


Installs malware or unwanted software

This trojan can install other malware or unwanted software onto your PC.



Connects to a remote host

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

• umbrella.no-ip.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

Additional information

Creates a mutex

This threat can create one or more mutexes on your PC. For example:

• abe20d48fadb3534dbee98d77de97e0d

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 320dbb503627b11c06bbfdca53b46ab3c0c63133.

Symptoms

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

• You see a file similar to:
• %APPDATA%\ping.exe
• %TEMP%\encryptado.exe
• \abe20d48fadb3534dbee98d77de97e0d.ex
  
• You see registry modifications such as:
  
  • In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Run
    Sets value: "abe20d48fadb3534dbee98d77de97e0d"
    With data: ""%APPDATA%\ping.exe" .."
    
    
  • In subkey: HKLM\Software\Microsoft\Windows\CurrentVersion\Run
    Sets value: "abe20d48fadb3534dbee98d77de97e0d"
    With data: ""%APPDATA%\ping.exe" .."
    
    
  • In subkey: HKLM\SYSTEM\CurrentControlSet\Services\WmiApRpl\Performance
    Sets value: "First Counter"
    With data: "0x00001e2a"
    
    
  • In subkey: HKLM\SYSTEM\CurrentControlSet\Services\WmiApRpl\Performance
    Sets value: "First Help"
    With data: "0x00001e2b"
    
    
  • In subkey: HKLM\SYSTEM\CurrentControlSet\Services\WmiApRpl\Performance
    Sets value: "Last Counter"
    With data: "0x00001ed0"
    
    
  • In subkey: HKLM\SYSTEM\CurrentControlSet\Services\WmiApRpl\Performance
    Sets value: "Last Help"
    With data: "0x00001ed1"
    
    
  • In subkey: HKLM\SYSTEM\CurrentControlSet\Services\WmiApRpl\Performance
    Sets value: "Object List"
    With data: "7722 7728 7738 7748 7768 7812 7822 7860 7866 7882"
    
    
  • In subkey: HKLM\SYSTEM\CurrentControlSet\Services\WmiApRpl\Performance
    Sets value: "PerfIniFile"
    With data: "wmiaprpl.ini"
    
    
• You see the following mutex:
• abe20d48fadb3534dbee98d77de97e0d

Last update 13 October 2015

 

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