Virus:TR/Dldr.Agent.uf.3
Date discovered:14/09/2005
Type:Trojan
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:11.317 Bytes
MD5 checksum:57039e5effa96389e1779f09e41619fc
VDF version:6.32.0.10

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Kaspersky: Trojan-Downloader.Win32.Agent.uf
   •  VirusBuster: Trojan.DL.Agent.GM1


Platforms / OS:
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP


Side effects:
   • Disable security applications
   • Downloads files
   • Registry modification

 Files It copies itself to the following location:
   • %SYSDIR%\ipwf.exe



The following file is created:

– %SYSDIR%\drivers\winut.dat



It tries to download some files:

– The locations are the following:
   • http://www.e**********tas.com/drupal/misc/1.txt
   • http://www.gar**********rld.co.uk/widgets/images/00.txt
   • http://www.gold**********s.com/audio/unix.txt
   • http://www.iar**********.uk/images/sys.txt
   • http://vom**********d.de/images/backup.txt
   • http://p**********ch/images/images/backup.txt
   • http://www.bs**********.com/images/backup.txt
   • http://www.dive**********rs.co.uk/backup.txt
   • http://**********.ru/love/cashe/ping.txt
   • http://www.k**********isr.saminfo.ru/Images/story.txt
   • http://d**********com/news/secret.txt
   • http://e**********b.ru/obmen/9374.txt
   • http://**********b.co.uk/IMAGES/paris.txt
   • http://ar**********s.co.uk/images/cashe/london.txt

 Registry One of the following values is added in order to run the process after reboot:

–  [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "IPFW"="%SYSDIR%\ipwf.exe"



It creates the following entries in order to bypass the Windows XP firewall:

– [HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\
   FirewallPolicy\StandardProfile\AuthorizedApplications\List]
   • %malware execution directory%\%executed file%=%malware execution directory%\%executed file%:*:Enabled:%executed file%
   • %SYSDIR%\ipwf.exe=%SYSDIR%\ipwf.exe:*:Enabled:ipwf



The following registry key is added:

– [HKLM\Software\Microsoft\Windows\CurrentVersion]
   • "WindowsShell" = dword:00000001

 Process termination List of processes that are terminated:
   • ZAPRO; zonealarm; armor2net; tpfw; NPROTECT; MpfService; kpf4gui;
      kpf4ss; firewall; ccapp; amon


 File details Programming language:
 The malware program was written in MS Visual C++.


Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with the following runtime packer:
   • FSG 2.0

Description inserted by Victor Tone on Thursday, September 15, 2005
Description updated by Victor Tone on Thursday, September 15, 2005

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