TROJ_DLOADER.U

Aliases: Trojan-Downloader.Win32.Monurl.gen (Kaspersky), Generic Downloader.g (McAfee), Downloader (Symantec), TR/Dldr.Monurl.1184 (Avira), Troj/Monurl-G (Sophos),

In the wild: Yes

Destructive: No

Language: English

Platform: Windows 95, 98, ME, NT, 2000, XP

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:

Medium

Distribution potential:

Low

Description: 

This Trojan creates the zero-byte file win32ioc1.TXT in drive C.

It downloads the file MSLOAD.EXE from the site http://theb<blocked>estsoft4u.com/pa. It then executes this file.

It also downloads the file TMP100.EXE from the site http://theb<blocked>estsoft4u.com/pa/cntr.php?adv=2. It then deletes MSLOAD.EXE and TMP100.EXE.

This Trojan runs on Windows 95, 98, ME, NT, 2000, and XP.

For additional information about this threat, see:

Description created: Dec. 14, 2004 6:59:53 PM GMT -0800


TECHNICAL DETAILS


Size of malware: 1,184 Bytes

Initial samples received on: Dec 8, 2004

Details:

This Trojan creates the zero-byte file win32ioc1.TXT in drive C.

It downloads the file MSLOAD.EXE from the site http://theb<blocked>estsoft4u.com/pa. It then executes this file.

It also downloads the file TMP100.EXE from the site http://theb<blocked>estsoft4u.com/pa/cntr.php?adv=2. It then deletes MSLOAD.EXE and TMP100.EXE.

This Trojan runs on Windows 95, 98, ME, NT, 2000, and XP.




Analysis by: Mary Gabriel


SOLUTION


Minimum scan engine version needed: 6.810

Pattern file needed: 2.286.05

Pattern release date: Dec 8, 2004


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.

Solution:

Identifying the Malware Program

To remove this malware, first identify the malware program.

  1. Scan your system with your Trend Micro antivirus product.
  2. NOTE all files detected as TROJ_DLOADER.U.

Trend Micro customers need to download the latest pattern file before scanning their system. Other users can use Housecall, Trend Micro�s free online virus scanner.

Terminating the Malware Program

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

  1. Open Windows Task Manager.
    � On Windows 95, 98, and ME, press
    CTRL%20ALT%20DELETE
    � On Windows NT, 2000, and XP, 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 system.
  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 systems running Windows 95, 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. Otherwise, continue with the next procedure, noting additional instructions.

Important Windows ME/XP Cleaning Instructions

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

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

Running Trend Micro Antivirus

Systems infected with this malware can be cleaned by simply scanning for and deleting files detected as TROJ_DLOADER.U. To do this, Trend Micro customers must download the latest pattern file and scan their system. Other Internet users can use HouseCall, Trend Micro�s online virus scanner.


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