BKDR_SYKIPOT.B

This backdoor may be unknowingly downloaded by a user while visiting malicious websites. It may be dropped by other malware.

It deletes the initially executed copy of itself.

Arrival Details

This backdoor may be unknowingly downloaded by a user while visiting malicious websites.

It may be dropped by the following malware:

• TROJ_PIDIEF.EGG

Installation

This backdoor drops the following files:

• %User Profile%\Local Settings\pdtpretty.tmp
• %User Profile%\Local Settings\ptpretty.tmp
• %User Profile%\Local Settings\WSE4EF1.TMP - also detected as BKDR_SYKIPOT.B

(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 drops the following copies of itself into the affected system:

• %User Profile%\Local Settings\pretty.exe

(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.)

Its DLL component is injected to the following process(es):

• outlook.exe
• iexplore.exe
• firefox.exe

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
office = "%User Profile%\Local Settings\pretty.exe"

Other Details

This backdoor deletes the initially executed copy of itself

NOTES:

It creates the file %User Profile%\Local Settings\pdtpretty.tmp, which contains the following information:

• Active network connection
• Adapter information (from ipconfgi /all)
• Contents of boot.ini
• Process injected
• Result of the command dir c:\*.url /s
• Running processes
• Started Windows services
• System information (OS, processor, bios version, time zone, memory, etc.)

It then encrypts the created file and saves it as %User Profile%\Local Settings\ptpretty.tmp. This is later on sent to the following server upon initial connection:

• https://www.{BLOCKED}her.com/asp/kys_allow_get.asp?name=getkys.kys&hostname=%7bhostname%7d-%7bip%7d-pretty20111122

If the connection is successful, it may perform the following routines depending on the server's reply:

• Execute files
• Perform shell commands
• Reboot system
• Terminate processes
• Upload and download files