Analysis by: Merianne Polintan
ALIASES:

TrojanDownloader:Win32/Dofoil.O(Microsoft),Trojan.Smoaler(Norton),Troj/Bredo-QM(Sophos),Trojan.Win32.Generic!BT(Sunbelt),W32/Yakes.AI!tr(Fortinet)

 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: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan executes then deletes itself afterward.

  TECHNICAL DETAILS

File Size: 43,008 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 15 Mar 2013

Installation

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

  • %Application Data%\{Random File Name}.exe

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

It executes then deletes itself afterward.

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\Policies\
Explorer\Run
Classes = "%Application Data%\{Random File Name}.exe"

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}372721.ru/sss/index.php

  SOLUTION

Minimum Scan Engine: 9.300

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\Policies\Explorer\Run
    • Classes = "%Application Data%\{Random File Name}.exe"

Step 4

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