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Trojan:Win32/Lowzones.DZ


Trojan:Win32/Lowzones.DZ is a malicious program that is unable to spread of its own accord. It may perform a number of actions of an attacker's choice on an affected computer.


What to do now

To detect and remove this threat and other malicious software that may have been installed in your computer, run a full-system scan with an up-to-date antivirus product such as the following: For more information about using antivirus software, see http://www.microsoft.com/windows/antivirus-partners/.

Threat behavior

Trojan:Win32/Lowzones.DZ is a malicious program that is unable to spread of its own accord. It may perform a number of actions of an attacker's choice on an affected computer.
Installation
Trojan:Win32/Lowzones.DZ creates the following files on an affected computer:

  • %programfiles%\yontoo layers runtime\yontooieclient.dll
  • c:\documents and settings\administrator\local settings\temp\3cf0c6a1.dat
  • c:\documents and settings\administrator\local settings\temp\7za.exe._tm
  • c:\documents and settings\administrator\local settings\temp\installhandler.txt.tmp
  • c:\documents and settings\administrator\local settings\temp\pagerage-silentinstaller-08d0.exe
  • c:\documents and settings\administrator\local settings\temp\pagerage-silentinstaller-08d0.log
  • c:\documents and settings\administrator\local settings\temp\yontooffclient.xpi._tm
  • c:\documents and settings\administrator\local settings\temp\yontooieclient.dll._tm
  • c:\documents and settings\administrator\local settings\temp\yontoolayers.crx._tm
  • c:\documents and settings\administrator\local settings\temp\yontoolayers.pem._tm
  • c:\documents and settings\administrator\local settings\temp\3cf0c6a1\_setup.dll
  • c:\documents and settings\administrator\local settings\temp\3cf0c6a1\_setupx.dll
  • c:\documents and settings\administrator\local settings\temp\3cf0c6a1\setup.ico
  • c:\documents and settings\administrator\local settings\temp\3cf0c6a1\x64\regsvr32.exe
  • c:\documents and settings\administrator\local settings\temp\3cf0c6a1\x86\regsvr32.exe
  • c:\documents and settings\administrator\local settings\temp\nsea.tmp\system.dll
  • c:\documents and settings\administrator\local settings\temp\nsy8.tmp\system.dll
  • c:\documents and settings\administrator\local settings\temprp\pagerage-silentinstaller.exe
  • c:\documents and settings\administrator\local settings\temprp\pconfirm.exe - detected as Trojan:Win32/Lowzones.DZ
  • c:\documents and settings\administrator\local settings\temprp\pinit.exe - detected as Trojan:Win32/Lowzones.DZ
Payload
Contacts remote hosts
Trojan:Win32/Lowzones.DZ may contact the following remote hosts using port 80:

  • www.mysystemexpert.com
  • www.yontoo.com

Commonly, malware may contact a remote host for the following purposes:
  • To confirm Internet connectivity
  • 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 c54b476abe333446ee1a606625b2cea240fdd4dc.

Symptoms

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

  • The presence of the following files:

  • %programfiles%\yontoo layers runtime\yontooieclient.dll
    c:\documents and settings\administrator\local settings\temp\3cf0c6a1.dat
    c:\documents and settings\administrator\local settings\temp\7za.exe._tm
    c:\documents and settings\administrator\local settings\temp\installhandler.txt.tmp
    c:\documents and settings\administrator\local settings\temp\pagerage-silentinstaller-08d0.exe
    c:\documents and settings\administrator\local settings\temp\pagerage-silentinstaller-08d0.log
    c:\documents and settings\administrator\local settings\temp\yontooffclient.xpi._tm
    c:\documents and settings\administrator\local settings\temp\yontooieclient.dll._tm
    c:\documents and settings\administrator\local settings\temp\yontoolayers.crx._tm
    c:\documents and settings\administrator\local settings\temp\yontoolayers.pem._tm
    c:\documents and settings\administrator\local settings\temp\3cf0c6a1\_setup.dll
    c:\documents and settings\administrator\local settings\temp\3cf0c6a1\_setupx.dll
    c:\documents and settings\administrator\local settings\temp\3cf0c6a1\setup.ico
    c:\documents and settings\administrator\local settings\temp\3cf0c6a1\x64\regsvr32.exe
    c:\documents and settings\administrator\local settings\temp\3cf0c6a1\x86\regsvr32.exe
    c:\documents and settings\administrator\local settings\temp\nsea.tmp\system.dll
    c:\documents and settings\administrator\local settings\temp\nsy8.tmp\system.dll
    c:\documents and settings\administrator\local settings\temprp\pagerage-silentinstaller.exe
    c:\documents and settings\administrator\local settings\temprp\pconfirm.exe
    c:\documents and settings\administrator\local settings\temprp\pinit.exe


Prevention


Alert level: High
First detected by definition: 1.109.1918.0
Latest detected by definition: 1.173.2181.0 and higher
First detected on: Aug 16, 2011
This entry was first published on: Aug 24, 2011
This entry was updated on: Aug 25, 2011

This threat is also detected as:
No known aliases