TR/Drop.Agent.uws - Trojan

See also

Summary

Full description

Statistics

Virus:	TR/Drop.Agent.uws
Date discovered:	26/02/2009
Type:	Trojan
Subtype:	Dropper
In the wild:	Yes
Reported Infections:	Low to medium
Distribution Potential:	Low to medium
Damage Potential:	Low to medium
Static file:	Yes
File size:	104.459 Bytes
MD5 checksum:	c86abd1d526e6eb03f27a7cc4b397d4e
IVDF version:	7.01.02.84 - Thu, 26 Feb 2009 07:22 (GMT+1)

General Method of propagation:
• Autorun feature

Aliases:
   • Mcafee: Generic PWS.ak trojan
   • Sophos: Troj/PWS-AYM
   • Panda: W32/Lineage.KOS
   • Eset: Win32/PSW.OnLineGames.NMY
   • Bitdefender: Trojan.PWS.OnLineGames.KCNF

Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003

Side effects:
   • Downloads malicious files
   • Drops malicious files
   • Lowers security settings
   • Registry modification

Files It copies itself to the following location:
   • %drive%\tvlx2fg.exe

The following files are created:

– %drive%\autorun.inf This is a non malicious text file with the following content:
   • %code that runs malware%

– %SYSDIR%\optyhww0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/PSW.OnLineGa.wnx

– %SYSDIR%\urretnd.exe Further investigation pointed out that this file is malware, too. Detected as: TR/Drop.Agent.ahdz

– %TEMPDIR%\ker1.tmp Further investigation pointed out that this file is malware, too. Detected as: TR/Drop.OnLi.123904

– %drive%\d1vmq.exe Further investigation pointed out that this file is malware, too. Detected as: TR/Drop.Agent.ahdz

– %SYSDIR%\optyhww1.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Crypt.XPACK.Gen

It tries to download some files:

– The location is the following:
   • http://vfgtyp.com/fm4/**********
Further investigation pointed out that this file is malware, too.

– The location is the following:
   • http://vbfdt.com/fm4/**********
Further investigation pointed out that this file is malware, too.

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

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "cbvcs"="%SYSDIR%\urretnd.exe"

The following registry key is added:

– [HKLM\SOFTWARE\Classes\CLSID\MADOWN]
   • "urlinfo"="afvbgy.m"

The following registry keys are changed:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\
   Connections]
   New value:
   • "DefaultConnectionSettings"=hex:46,00,00,00,05,00,00,00,09,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,04,00,00,00,00,00,00,00,70,89,60,1E,B4,66,CA,01,00,00,00,00,00,00,00,00,00,00,00,00,01,00,00,00,02,00,00,00,C0,A8,6B,64,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   New value:
   • "Hidden"=dword:0x00000002
   • "ShowSuperHidden"=dword:0x00000000

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\
   Folder\Hidden\SHOWALL]
   New value:
   • "CheckedValue"=dword:0x00000000

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 Petre Galan on Mon, 16 Nov 2009 12:05 (GMT+1)
Description updated by Andrei Ivanes on Mon, 23 Nov 2009 13:49 (GMT+1)

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