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BKDR_CYCBOT.NYZ

October 09, 2012
 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.

  TECHNICAL DETAILS

File Size:

287,232 bytes

Memory Resident:

Yes

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\7CCB\C29.exe

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

It drops the following files:

  • %Application Data%\B0B2D\D6E3.0B2
  • %Application Data%\Microsoft\CryptnetUrlCache\Content\A44F4E7CB3133FF765C39A53AD8FCFDD
  • %Application Data%\Microsoft\CryptnetUrlCache\MetaData\A44F4E7CB3133FF765C39A53AD8FCFDD
  • %Application Data%\Microsoft\CryptnetUrlCache\Content\2BF68F4714092295550497DD56F57004
  • %Application Data%\Microsoft\CryptnetUrlCache\Content\696F3DE637E6DE85B458996D49D759AD
  • %Application Data%\Microsoft\CryptnetUrlCache\Content\7B2238AACCEDC3F1FFE8E7EB5F575EC9
  • %Application Data%\Microsoft\CryptnetUrlCache\Content\A1377F7115F1F126A15360369B165211
  • %Application Data%\Microsoft\CryptnetUrlCache\Content\A8FABA189DB7D25FBA7CAC806625FD30
  • %Application Data%\Microsoft\CryptnetUrlCache\Content\C554DCF706A5AAB8B360FAD227EAB9C7
  • %Application Data%\Microsoft\CryptnetUrlCache\Content\E8974A4669383843486E5AFDB09650F5
  • %Application Data%\Microsoft\CryptnetUrlCache\MetaData\2BF68F4714092295550497DD56F57004
  • %Application Data%\Microsoft\CryptnetUrlCache\MetaData\696F3DE637E6DE85B458996D49D759AD
  • %Application Data%\Microsoft\CryptnetUrlCache\MetaData\7B2238AACCEDC3F1FFE8E7EB5F575EC9
  • %Application Data%\Microsoft\CryptnetUrlCache\MetaData\A1377F7115F1F126A15360369B165211
  • %Application Data%\Microsoft\CryptnetUrlCache\MetaData\A8FABA189DB7D25FBA7CAC806625FD30
  • %Application Data%\Microsoft\CryptnetUrlCache\MetaData\C554DCF706A5AAB8B360FAD227EAB9C7
  • %Application Data%\Microsoft\CryptnetUrlCache\MetaData\E8974A4669383843486E5AFDB09650F5

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

It creates the following folders:

  • %Application Data%\B0B2D
  • %Program Files%\2D6E3
  • %Program Files%\LP

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

Autostart Technique

This backdoor adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
C29.exe = "%Program Files%\LP\7CCB\C29.exe"

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\0open
HWID = "{random values}"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
ProxyServer = "http=127.0.0.1:57677"

It modifies the following registry entries:

HKEY_CURRENT_USER\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.)

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.)

It deletes the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\wscsvc