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TROJ_DLOADR.EHIY

October 08, 2012
 Analysis by: Sabrina Lei Sioting
 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 arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It executes downloaded files whose malicious routines are exhibited by the affected system.

  TECHNICAL DETAILS

File Size:

94,208 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

10 May 2011

Payload:

Connects to URLs/IPs

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.

Download Routine

This Trojan accesses the following websites to download files:

  • %User Temp%\bdel
  • %User Temp%\dll64ocx
  • %User Temp%\tempox
  • %User Temp%\win32com

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)

It executes downloaded files :

  • %User Temp%\est.exe
  • %User Temp%\hiphelp.exe

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)

whose malicious routines are exhibited by the affected system.

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}ana.org/media/archivo.html

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

8.146.12

FIRST VSAPI PATTERN DATE:

09 May 2011

VSAPI OPR PATTERN File:

8.147.00

VSAPI OPR PATTERN Date:

09 May 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

Search and delete these files

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.
  • %User Temp%\bdel
  • %User Temp%\dll64ocx
  • %User Temp%\tempox
  • %User Temp%\win32com
  • %User Temp%\est.exe
  • %User Temp%\hiphelp.exe

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_DLOADR.EHIY. 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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