TR/Dldr.Agent.tc.4 - Trojan

See also

Summary

Full description

Statistics

Virus:	TR/Dldr.Agent.tc.4
Date discovered:	28/10/2005
Type:	Trojan
Subtype:	Downloader
In the wild:	No
Reported Infections:	Low
Distribution Potential:	Low
Damage Potential:	Low to medium
Static file:	Yes
File size:	28.160 Bytes
MD5 checksum:	f128d971ad293672f2ced609c51cb6b2
VDF version:	6.32.00.111 - Mon, 24 Oct 2005 15:17 (GMT+1)

General Method of propagation:
   • No own spreading routine

Aliases:
   • Symantec: Trojan.Flush.A
   • Kaspersky: Trojan-Downloader.Win32.Agent.tc
   • Bitdefender: Trojan.DNSChanger.R

Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003

Side effects:
   • Downloads malicious files
   • Registry modification

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

It deletes the initially executed copy of itself.

It deletes the following file:
   • %SYSDIR%\hgqhp.exe

It tries to download some files:

– The location is the following:
   • http://195.**********.100/users/serg/web/files/images/coded1.jpg
It is saved on the local hard drive under: %SYSDIR%\coded1.exe Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: TR/Dldr.Xsvix

– The location is the following:
   • http://195.**********.100/users/serg/web/files/images/logo_small.jpg
It is saved on the local hard drive under: %SYSDIR%\logo_small.exe Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: TR/Pipas.A

– The location is the following:
   • http://195.**********.100/users/serg/web/files/images/hlmicro.jpg
It is saved on the local hard drive under: %SYSDIR%\hlmicro.exe Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: ADSPY/Msnagent.B

– The location is the following:
   • http://195.**********.100/users/serg/web/files/images/hwiper.jpg
It is saved on the local hard drive under: %SYSDIR%\hwiper.exe Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: TR/Qhost.DF

– The location is the following:
   • http://195.**********.100/users/serg/web/files/images/favme.jpg
It is saved on the local hard drive under: %SYSDIR%\favme.exe Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: TR/Favadd.AN

– The location is the following:
   • http://195.**********.100/users/serg/web/files/images/bndmod.jpg
It is saved on the local hard drive under: %SYSDIR%\bndmod.exe Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too.

– The location is the following:
   • http://85.**********.43/dgprpsetup.exe
It is saved on the local hard drive under: %SYSDIR%\dgprpsetup.exe Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: TR/Dldr.Agent.SY

– The location is the following:
   • http://the**********.com/config.php
It is saved on the local hard drive under: %WINDIR%\rdt.ini

– The location is the following:
   • http://195.**********.100/users/serg/web/files/images/empty.gif
It is saved on the local hard drive under: %SYSDIR%\%five-digit random character string%.dll Detected as: TR/Drop.Small.XL

Registry The following registry key is added in order to run the process after reboot:

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

The value of the following registry key is removed:

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "%executed file%"="%malware execution directory%\%executed file%"

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

The following registry keys are added:

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\ruins\1dedoc]
– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\ruins\llams_ogol]
– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\ruins\repiwh]
– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\ruins\emvaf]
– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\ruins\domdnb]
– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\ruins\orcimlh]
– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Urls]
   • "1dedoc"=hex:%hex values%
   • "llams_ogol"=hex:%hex values%
   • "repiwh"=hex:%hex values%
   • "ytpme"=hex:%hex values%
   • "emvaf"=hex:%hex values%
   • "domdnb"=hex:%hex values%
   • "orcimlh"=hex:%hex values%
   • "putesprpgd"=hex:%hex values%

– [HKLM\SOFTWARE\SearchToolbar\Toolbar]
   • "Version"="1.1"
   • "OptdateTest"=dword:4365eb0a

– [HKCR\ToolBand.ToolBandObj.1]
   • @="SearchToolbar"

– [HKCR\ToolBand.ToolBandObj.1\CLSID]
   • @="{08BEC6AA-49FC-4379-3587-4B21E286C19E}"

– [HKCR\ToolBand.ToolBandObj]
   • @="SearchToolbar"

– [HKCR\ToolBand.ToolBandObj\CLSID]
   • @="{08BEC6AA-49FC-4379-3587-4B21E286C19E}"

– [HKCR\ToolBand.ToolBandObj\CurVer]
   • @="ToolBand.ToolBandObj.1"

– [HKCR\CLSID\{08BEC6AA-49FC-4379-3587-4B21E286C19E}]
   • @="SearchToolbar"

– [HKCR\CLSID\{08BEC6AA-49FC-4379-3587-4B21E286C19E}\InprocServer32]
   • @="%SYSDIR%\hzpvq.dll"

– [HKCR\CLSID\{08BEC6AA-49FC-4379-3587-4B21E286C19E}\ProgID]
   • @="ToolBand.ToolBandObj.1"

– [HKCR\CLSID\{08BEC6AA-49FC-4379-3587-4B21E286C19E\
   VersionIndependentProgID]
   • @="ToolBand.ToolBandObj"

– [HKCR\TypeLib\{110FA82F-DB6C-3C24-8929-60961D10C56E}\1.0]
   • @="IDEHandler"

– [HKCR\TypeLib\{110FA82F-DB6C-3C24-8929-60961D10C56E}\1.0\0\win32]
   • @="%SYSDIR%\hzpvq.dll"

– [HKCR\TypeLib\{110FA82F-DB6C-3C24-8929-60961D10C56E}\1.0\FLAGS]
   • @="0"

– [HKCR\TypeLib\{110FA82F-DB6C-3C24-8929-60961D10C56E}\1.0\HELPDIR]
   • @="%sysdir%\"

Injection – It injects the following file into a process: %malware dll%

Process name:
• explorer.exe

Rootkit Technology It is a malware-specific technology. The malware hides its presence from system utilities, security applications and in the end, from the user.

Hides the following:
– Its own files
– Its own registry keys

Method used:
• Hidden from Windows API

File details Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

See a brief description here.

Description inserted by Iulia Diaconescu on Tue, 01 Nov 2005 17:54 (GMT+1)
Description updated by Iulia Diaconescu on Mon, 28 Nov 2005 17:22 (GMT+1)

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