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BKDR_RUSTOCK.SMA

July 21, 2013
 Analysis by: Christopher Daniel So
 ALIASES:

Trojan.Pandex (Symantec), Backdoor.Win32.NewRest.bc (Kaspersky), W32/NewRest.A.gen!Eldorado (Authentium), Backdoor.WinNt.Rustock (Ikarus)

 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:

Varies

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

20 Jan 2010

Payload:

Drops files

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:

  • %User Temp%\A.tmp

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

Autostart Technique

This backdoor registers its dropped component as a system service to ensure its automatic execution at every system startup. It does this by creating the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{random hexadecimal number}

Dropping Routine

This backdoor drops the following files:

  • %System%\drivers\{random hexadecimal number}.sys - detected by live casino online as BKDR_RUSTOCK.SMB

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI OPR PATTERN File:

6.793.00

VSAPI OPR PATTERN Date:

21 Jan 2010

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must to allow full scanning of their computers.

Step 2

Remove the malware/grayware file dropped/downloaded by BKDR_RUSTOCK.SMA

    If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.

    • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
      • {random hexadecimal number}

Step 4

Scan your computer with your live casino online product to delete files detected as BKDR_RUSTOCK.SMA. If the detected files have already been cleaned, deleted, or quarantined by your live casino online product, no further step is required. You may opt to simply delete the quarantined files. Please check this for more information.