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TSPY_SIMDA.TUS

March 11, 2013
 Analysis by: Mark Joseph Manahan
 ALIASES:

Trojan:Win32/Malagent (Microsoft), Win32/Simda.P trojan (Eset)

 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:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware


This spyware may be dropped by other malware.

It executes then deletes itself afterward.

  TECHNICAL DETAILS

File Size:

86,528 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

06 Mar 2013

Payload:

Connects to URLs/IPs

Arrival Details

This spyware may be dropped by other malware.

Installation

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

  • %User Profile%\{random}-0.exe

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

It executes then deletes itself afterward.

Autostart Technique

This spyware creates the following registry entries to enable automatic execution of dropped component at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Windows Update Server = "%User Profile%\{random}-0.exe"

Other Details

This spyware connects to the following possibly malicious URL:

  • {BLOCKED}t.{pseudorandom}.com

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

9.774.03

FIRST VSAPI PATTERN DATE:

08 Mar 2013

VSAPI OPR PATTERN File:

9.775.00

VSAPI OPR PATTERN Date:

09 Mar 2013

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

Restart in Safe Mode

[ 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
    • Windows Update Server = "%User Profile%\{random}-0.exe"

Step 4

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