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TROJ_DLOADR.AGN

October 09, 2012
 Modified by: Christopher Daniel So
 PLATFORM:

Windows 2000, Windows XP, Windows 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 accesses a certain URL to obtain the link where to download a file and its file name.

It then executes the downloaded file. However, as of this writing, the said URL is no longer accessible.

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

06 Dec 2011

Payload:

Downloads files

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\ilmasto

It adds the following registry entries:

HKEY_CURRENT_USER\Software\ilmasto
today = "{current date}"

NOTES:

It accesses the following URL to obtain the link where to download a file and its file name:

  • http://{BLOCKED}nter.co.kr/cnters/ilmasto/check_update.php

It then downloads the file from the returned URL and saves it as %Application Data%\{returned file name}. It then executes the downloaded file. However, as of this writing, the said URL is no longer accessible.

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.627.00

FIRST VSAPI PATTERN DATE:

06 Dec 2011

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Restart in Safe Mode

[ Learn More ]

Step 3

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_CURRENT_USER\Software
    • ilmasto

Step 4

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