TR/Drop.Agent.df.4 - Trojan

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Full description

Virus:	TR/Drop.Agent.df.4
Date discovered:	09/02/2009
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:	106.470 Bytes
MD5 checksum:	e085fb1841f91237edee643f04fc56cc
IVDF version:	7.01.01.244

General Method of propagation:
• Autorun feature

Aliases:
   • Mcafee: Generic PWS.ak trojan
   • Sophos: Mal/EncPk-HI
   • Panda: W32/Lineage.KMZ
   • Eset: Win32/PSW.OnLineGames.NMY
   • Bitdefender: Trojan.PWS.OnlineGames.KBOS

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

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

Files It copies itself to the following locations:
   • %SYSDIR%\uret463.exe
   • %drive%\9b8kmipy.com

It deletes the initially executed copy of itself.

The following files are created:

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

– %SYSDIR%\lhgjyit0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Crypt.XPACK.Gen

It tries to download a file:

– The location is the following:
   • http://rtgma.com/xjj/**********
At the time of writing this file was not online for further investigation.

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

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "dorfgwe"="%SYSDIR%\uret463.exe"

The following registry keys are changed:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\
   Connections]
   New value:
   • "DefaultConnectionSettings"=hex:46,00,00,00,04,00,00,00,09,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,04,00,00,00,00,00,00,00,B0,E9,B7,4C,18,78,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.

Inserted by Petre Galan on Tue, 08 Dec 2009 15:10 (GMT+1)
Updated by Petre Galan on Tue, 08 Dec 2009 15:14 (GMT+1)

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TR/Drop.Agent.df.4 - Trojan

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