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TrojanDropper:Win32/Bancos.N


First posted on 11 November 2015.
Source: Microsoft

Aliases :

There are no other names known for TrojanDropper:Win32/Bancos.N.

Explanation :

Threat behavior

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

  • %ProgramFiles%\google chrome\help34.exe
  • %ProgramFiles%\google chrome\help35.exe
  • %ProgramFiles%\google chrome\setup4.exe
  • %TEMP%\hyd7b66.tmp.1445772116\hta\install.1445772116.zip


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: "Help34.exe"
With data: "%ProgramFiles%\google chrome\help34.exe"
Sets value: "Help35.exe"
With data: "%ProgramFiles%\google chrome\help35.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. 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:

  • Setup4.exe


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 b7d9f035431c4c9f199b9ededd79340c994b6008.

Symptoms

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

  • You see a file similar to:
    • %ProgramFiles%\google chrome\help34.exe
    • %ProgramFiles%\google chrome\help35.exe
    • %ProgramFiles%\google chrome\setup4.exe
    • %TEMP%\hyd7b66.tmp.1445772116\hta\install.1445772116.zip
  • You see registry modifications such as:

    • In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Run
      Sets value: "Help34.exe"
      With data: "%ProgramFiles%\google chrome\help34.exe"
    • In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Run
      Sets value: "Help35.exe"
      With data: "%ProgramFiles%\google chrome\help35.exe"
  • You see the following mutex:
    • Setup4.exe

Last update 11 November 2015

 

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