TR/Proxy.Small.bt.3 - Trojan

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Summary

Full description

Statistics

Virus:	TR/Proxy.Small.bt.3
Date discovered:	20/09/2005
Type:	Trojan
In the wild:	No
Reported Infections:	Low
Distribution Potential:	Low
Damage Potential:	Medium
Static file:	Yes
File size:	36.352 Bytes
MD5 checksum:	ec469506177f115016bff393a1d920f1
VDF version:	6.31.0.112

General Method of propagation:
   • No own spreading routine

Aliases:
   • Symantec: Trojan-Proxy.Win32.Small.bt
   • TrendMicro: TROJ_SMALL.AKQ
   • Sophos: Troj/Stox-A
   • Eset: Win32/TrojanProxy.Small.BT
   • Bitdefender: Trojan.Proxy.Win32.Small.BT

Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows 2000
   • Windows XP

Side effects:
   • Registry modification
   • Steals information

Files The following file is created:

– %WINDIR%\inetdata\tmp.req

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

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

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

– HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\
   FirewallPolicy\StandardProfile
   • "DoNotAllowExceptions"=dword:00000000

– HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\
   FirewallPolicy\StandardProfile\GloballyOpenPorts\List
   • "%opened port%:TCP"="%opened port%:TCP:*:Enabled:Microsoft standard
      protector"

Backdoor The following port is opened:

– %executed file% on a random TCP port in order to provide a Socks 5 proxy server.

Contact server:
The following:
• traff-**********.com/affiliate/socks/insert.php?

As a result it may send some information. This is done via the HTTP GET request on a PHP script.
The servers answer is written to the file: %malware execution directory%\tmp.req

Sends information about:
• Opened port

File details Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with the following runtime packers:
   • PE_Patch.PECompact
   • PecBundle
   • PECompact

See a brief description here.

Description inserted by Irina Boldea on Tue, 20 Sep 2005 09:31 (GMT+1)
Description updated by Irina Boldea on Mon, 26 Sep 2005 16:28 (GMT+1)

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