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BKDR_SYKIPOT.B

October 09, 2012
 Analysis by: Erika Bianca Mendoza
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

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.

  TECHNICAL DETAILS

File Size:

40,960 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

07 Dec 2011

Payload:

Connects to URLs/IPs

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

  SOLUTION

Minimum Scan Engine:

9.200

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you to allow full scanning of your computer.

Step 2

Remove the malware/grayware file that dropped/downloaded BKDR_SYKIPOT.B