Modified by: Sabrina Lei Sioting
ALIASES:

Trojan:Win32/Tobfy.L (Microsoft), Trojan.Win32.Tobfy (Ikarus),

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware, Spammed via email

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It connects to a website to send and receive information.

  TECHNICAL DETAILS

File Size: 212,480 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 24 Dec 2012
Payload: Connects to URLs/IPs, Downloads files, Terminates processes

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
GoogleChrome = "{malware path}\{malware name}.exe"

Backdoor Routine

This Trojan opens the following ports:

  • 180

It connects to the following websites to send and receive information:

  • {BLOCKED}29.104

Process Termination

This Trojan terminates the following processes if found running in the affected system's memory:

  • taskmgr.exe
  • msconfig.exe
  • regedit.exe
  • cmd.exe

Download Routine

This Trojan connects to the following URL(s) to download its component file(s):

  • http://{BLOCKED}r1.ru/Silence/read.php?nm=32432

NOTES:

It modifies the following registry keys in order to prevent the system to restart in Safe Mode:
From: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\SafeBoot\Minimal
To: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\SafeBoot\mini

From: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\SafeBoot\Network
To: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\SafeBoot\net

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 9.614.05
FIRST VSAPI PATTERN DATE: 24 Dec 2012

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

Identify and delete files detected as TROJ_RANSOM.SM09 using the Recovery Console

[ Learn More ]

Step 3

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

 
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • GoogleChrome = "{malware path}\{malware name}.exe"

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_RANSOM.SM09. 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.

NOTES:

Restore Safe Boot Registry Settings

To restore safe boot registry settings:

  1. Open a text editor like Notepad.
  2. Copy and paste the following script:
    • On Windows 2000:
    • On Windows Server 2003:
    • On Windows XP:
    • On Windows Vista:
    • On Windows 7:
  3. Save this file as RESTORE.REG.
  4. Execute the file RESTORE.REG.


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