TROJ_SASFIS.AM

 Analysis by: Marfel Tiamzon

 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW


This Trojan may be dropped by other malware.

It modifies registry entries to enable its automatic execution at every system startup.

  TECHNICAL DETAILS

File Size:

21,504 bytes

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

26 Oct 2010

Arrival Details

This Trojan may be dropped by the following malware:

Installation

This Trojan drops the following copies of itself into the affected system:

  • %System%\{random file name}

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

It injects itself into the following processes running in the affected system's memory:

  • svchost.exe

Autostart Technique

This Trojan modifies the following registry entries to ensure it automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Shell = Explorer.exe rundll32.exe {malware file name} {random export module name}

(Note: The default value data of the said registry entry is Explorer.exe.)

Other System Modifications

This Trojan adds the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\Software\Microsoft\
Office\{version}\Word\
Security
AccessVBOM = 0

HKEY_CURRENT_USER\Software\Microsoft\
Office\{version}\Word\
Security
Level = 4

It adds the following registry keys as part of its installation routine:

HKEY_CLASSES_ROOT\idid

  SOLUTION

Minimum Scan Engine:

8.900

Step 1

For Windows ME and XP users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Remove malware files dropped/downloaded by TROJ_SASFIS.AM

Step 3

Scan your computer with your Trend Micro product and note files detected as TROJ_SASFIS.AM

Step 4

Restart in Safe Mode

[ Learn More ]

Step 5

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\Office\{version}\Word\Security
    • AccessVBOM = 0
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\{version}\Word\Security
    • Level = 4

Step 6

Delete this registry key

[ 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_CLASSES_ROOT
    • idid

Step 7

Restore this modified 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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
    • From: Shell = Explorer.exe rundll32.exe {malware file name} {random export module name}
      To: Shell = Explorer.exe

Step 8

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_SASFIS.AM 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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