Malware type: Trojan

Aliases: Trojan-Downloader.Win32.Tiny.acp (Kaspersky), TR/Dldr.Tiny.ACP.2 (Avira),

In the wild: Yes

Destructive: No

Language: English

Platform: Windows 98, ME, NT, 2000, XP, Server 2003

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:


Distribution potential:



This Trojan may be dropped by other malware. It may be downloaded unknowingly by a user when visiting malicious Web sites.

It drops copies of itself.

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

It connects to a certain URL to download possibly malicious files.

For additional information about this threat, see:

Description created: Mar. 10, 2008 10:21:27 PM GMT -0800


File type: PE

Memory resident:  Yes

Size of malware: 4,096 Bytes


Arrival Details

This Trojan may be dropped by other malware.

It may be downloaded unknowingly by a user when visiting malicious Web site(s).


This Trojan drops the following copy of itself:

  • %System%\glock32.exe

(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. )

Autostart Techniques

This Trojan creates the following registry entry(ies) to enable its automatic execution at every system startup:

Glock Suite 1.1 = "%System%\glock32.exe"

It connects to the following URL to download possibly malicious files:

  • http://{BLOCKED}.{BLOCKED}.34.166/newforum/index.php

However, as of this writing, the said URL is inaccessible.

Affected Platforms

This Trojan runs on Windows 98, ME, NT, 2000, XP, and Server 2003.

Analysis By: Michael Cabel

Revision History:

First pattern file version: 5.154.03
First pattern file release date: Mar 10, 2008


Minimum scan engine version needed: 8.300

Pattern file needed: 5.655.00

Pattern release date: Nov 16, 2008

Important note: The "Minimum scan engine" refers to the earliest Trend Micro scan engine version guaranteed to detect this threat. However, Trend Micro strongly recommends that you update to the latest version in order to get comprehensive protection. Download the latest scan engine here.


Identifying the Malware Files

  1. Scan your computer with your Trend Micro antivirus product.
  2. Note the path and file name of all files detected as TROJ_TINY.GV.

Trend Micro customers need to download the latest virus pattern file before scanning their computer. Other users can use Housecall, the Trend Micro online threat scanner.

Terminating the Malware Program

This procedure terminates the running malware process. You will need the name(s) of the file(s) detected earlier.

If the process you are looking for is not in the list displayed by Task Manager, proceed to the succeeding solution set.

  1. Open Windows Task Manager.
    • On Windows 98 and ME, press
    • On Windows NT, 2000, XP, and Server 2003, press
    CTRL%20SHIFT%20ESC, then click the Processes tab.
  2. In the list of running programs*, locate the malware file(s) detected earlier.
  3. Select one of the detected files, then press either the End Task or the End Process button, depending on the version of Windows on your computer.
  4. Do the same for all detected malware files in the list of running processes.
  5. To check if the malware process has been terminated, close Task Manager, and then open it again.
  6. Close Task Manager.

*NOTE: On computers running Windows 98 and ME, Windows Task Manager may not show certain processes. You can use a third party process viewer such as Process Explorer to terminate the malware process.

On computers running all Windows platforms, if the process you are looking for is not in the list displayed by Task Manager or Process Explorer, continue with the next solution procedure, noting additional instructions. If the malware process is in the list displayed by either Task Manager or Process Explorer, but you are unable to terminate it, restart your computer in safe mode.

Removing Autostart Entries from the Registry

This solution deletes registry entries added by this malware. Before performing the steps below, make sure you know how to back up the registry and how to restore it if a problem occurs. Refer to this Microsoft article for more information about modifying your computer's registry.

  1. Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
  2. In the left panel, double-click the following:
  3. In the right panel, locate and delete the entry:
    • Glock Suite 1.1 = "%System%\glock32.exe"
  4. Close Registry Editor.

Important Windows ME/XP Cleaning Instructions

Users running Windows ME and XP must disable System Restore to allow full scanning of infected computers.

Users running other Windows versions can proceed with the succeeding solution set(s).

Running Trend Micro Antivirus

If you are currently running in safe mode, please restart your computer normally before performing the following solution.

Scan your computer with Trend Micro antivirus and delete files detected as TROJ_TINY.GV . To do this, Trend Micro customers must download the latest virus pattern file and scan their computer. Other Internet users can use HouseCall, the Trend Micro online virus scanner.

Trend Micro offers best-of-breed antivirus and content-security solutions for your corporate network, small and medium business, mobile device or home PC.