Analysis by: Christopher Daniel So
ALIASES:

Backdoor:Win32/Tofsee.I (Microsoft), Backdoor.Win32.Inject.cvj (Kaspersky), W32/Slenfbot.AD (Panda)

 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

This backdoor may be dropped by other malware.

  TECHNICAL DETAILS

File Size: Varies
File Type: PE
File Compression: UPX
Memory Resident: No
Initial Samples Received Date: 03 Jan 2011

Arrival Details

This backdoor may be dropped by other malware.

Other Details

This backdoor does the following:

  • Loads, decrypts and executes the file %System%\secupdat.dat.

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

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 7.746.13
FIRST VSAPI PATTERN DATE: 04 Jan 2011

Step 1

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

Step 2

Scan your computer with your Trend Micro product to delete files detected as BKDR_TOFSEE.SMI. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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