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TrojanDownloader:Win32/Carberp.A


TrojanDownloader:Win32/Carberp.A is a trojan that silently downloads and installs other programs without consent. This could include the installation of additional malware or malware components to an affected computer.


What to do now

Manual removal is not recommended for this threat. To detect and remove this threat and other malicious software that may have been installed, run a full-system scan with an up-to-date antivirus product such as Microsoft Security Essentials, or the Microsoft Safety Scanner. For more information about using antivirus software, see http://www.microsoft.com/security/antivirus/av.aspx.

Threat behavior

TrojanDownloader:Win32/Carberp.A is a trojan that silently downloads and installs other programs without consent. This could include the installation of additional malware or malware components to an affected computer.
Installation
When executed, TrojanDownloader:Win32/Carberp.A copies itself to the following locations:

  • c:\documents and settings\administrator\local settings\temp\11.tmp
  • c:\documents and settings\administrator\start menu\programs\startup\msconfig32.exe

The malware creates the following files on an affected computer:

  • c:\documents and settings\administrator\local settings\temp\10.tmp
  • c:\documents and settings\administrator\local settings\temp\12.tmp
  • c:\documents and settings\administrator\local settings\temp\13.tmp
  • c:\documents and settings\administrator\local settings\temp\14.tmp
  • c:\documents and settings\administrator\local settings\temp\15.tmp
  • c:\documents and settings\administrator\local settings\temp\16.tmp
  • c:\documents and settings\administrator\local settings\temp\17.tmp
  • c:\documents and settings\administrator\local settings\temp\e.tmp
  • c:\documents and settings\administrator\local settings\temp\f.tmp

The malware utilizes code injection in order to hinder detection and removal. When TrojanDownloader:Win32/Carberp.A executes, it may inject code into running processes, including the following, for example:

  • explorer.exe

Payload
Contacts remote host
TrojanDownloader:Win32/Carberp.A may contact a remote host at iliked.org using port 80. Commonly, malware may contact a remote host for the following purposes:
  • To report a new infection to its author
  • To receive configuration or other data
  • To download and execute arbitrary files (including updates or additional malware)
  • To receive instruction from a remote attacker
  • To upload data taken from the affected computer

This malware description was produced and published using our automated analysis system's examination of file SHA1 f0711c3d8a16974334e851fa267eed90b209873a.

Symptoms

System changes
The following system changes may indicate the presence of this malware:

  • The presence of the following files:
  • c:\documents and settings\administrator\local settings\temp\10.tmp
    c:\documents and settings\administrator\local settings\temp\11.tmp
    c:\documents and settings\administrator\local settings\temp\12.tmp
    c:\documents and settings\administrator\local settings\temp\13.tmp
    c:\documents and settings\administrator\local settings\temp\14.tmp
    c:\documents and settings\administrator\local settings\temp\15.tmp
    c:\documents and settings\administrator\local settings\temp\16.tmp
    c:\documents and settings\administrator\local settings\temp\17.tmp
    c:\documents and settings\administrator\local settings\temp\e.tmp
    c:\documents and settings\administrator\local settings\temp\f.tmp
    c:\documents and settings\administrator\start menu\programs\startup\msconfig32.exe


Prevention


Alert level: Severe
First detected by definition: 1.73.24.0
Latest detected by definition: 1.179.1150.0 and higher
First detected on: Jan 22, 2010
This entry was first published on: Sep 16, 2010
This entry was updated on: Apr 17, 2011

This threat is also detected as:
  • Backdoor.Win32.IRCNite.jg (Kaspersky)
  • Trojan.Zbot (Symantec)