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BKDR_CYCBOT.UITY

October 09, 2012
 Analysis by: rolandde
 ALIASES:

Backdoor:Win32/Cycbot.G (Microsoft); Trojan.Win32.Jorik.Gbot.qxy (Kaspersky)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It connects to a website to send and receive information.

  TECHNICAL DETAILS

File Size:

287,232 bytes

File Type:

EXE

Initial Samples Received Date:

25 Nov 2011

Arrival Details

This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This backdoor drops the following copies of itself into the affected system:

  • %Program Files%\LP\{random}\{random}.exe

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)

It drops the following non-malicious file:

  • %User Profile%\Application Data\{random}\{random}

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

It creates the following folders:

  • %User Profile%\Application Data\{random}
  • %Program Files%\{random}
  • %Program Files%\LP
  • %Program Files%\LP\{random}

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.. %Program Files% is the default Program Files folder, usually C:\Program Files.)

Other System Modifications

This backdoor adds the following registry keys:

HKEY_CURRENT_USER\0open

It adds the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
ProxyServer = "http={BLOCKED}7.{BLOCKED}.0.1:59798"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{random}.exe = "%Program Files%\LP\{random}\{random}.exe"

It modifies the following registry key(s)/entry(ies) as part of its installation routine:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
ProxyEnable = "1"

(Note: The default value data of the said registry entry is 0.)

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Hardware Profiles\0001\Software\
Microsoft\windows\CurrentVersion\
Internet Settings
ProxyEnable = "1"

(Note: The default value data of the said registry entry is 0.)

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Hardware Profiles\Current\Software\
Microsoft\windows\CurrentVersion\
Internet Settings
ProxyEnable = "1"

(Note: The default value data of the said registry entry is 0.)

HKEY_CURRENT_CONFIG\Software\Microsoft\
windows\CurrentVersion\Internet Settings
ProxyEnable = "1"

(Note: The default value data of the said registry entry is 0.)

It deletes the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\wscsvc

Backdoor Routine

This backdoor connects to the following websites to send and receive information:

  • {BLOCKED}accesss.com
  • {BLOCKED}amaforyou.com
  • {BLOCKED}ipitour.com
  • {BLOCKED}rdelis.com
  • {BLOCKED}4image.com
  • {BLOCKED}t4you.com
  • {BLOCKED}ontainer.com
  • {BLOCKED}eurosys.com
  • {BLOCKED}bletpcforme.com
  • {BLOCKED}ldonlines.com
  • {BLOCKED}tfrommains.com
  • {BLOCKED}reportsystem.com