TROJ_DLOADER.OOP

May 27, 2014
 Analysis by: Adrian Cofreros
 ALIASES:

PWS:Win32/Zbot(Microsoft),TR/VB.Downloader.2080(Antivir)

 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:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • 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.

  TECHNICAL DETAILS

File Size:

131,072 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

24 May 2014

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\Microsoft\
{string containing random application}

HKEY_CURRENT_USER\Software\Microsoft\
{GUID 1}

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
{string containing random application}
{random string} = "{hex values 1}"

HKEY_CURRENT_USER\Software\Microsoft\
{GUID 1}
{GUID 2} = "{hex values 2}"

HKEY_CURRENT_USER\Software\Microsoft\
{GUID 1}
{GUID 3} = "{hex values 3}"

HKEY_CURRENT_USER\Software\Microsoft\
{GUID 1}
{GUID 4} = "{hex values 4}"

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}2j3lo8jf777.com/www/index/
  • http://{BLOCKED}3lo8jf78.com/www/

  SOLUTION

Minimum Scan Engine:

9.700

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

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

Step 4

The following created registry key(s) cannot be identified by the user since there are no reference values in the created key. The only way it can be identified is by comparing the present keys with a backup of the system registry. Note that the said key(s) do not have to be deleted since it won't be harmful to the system:

  • In HKEY_CURRENT_USER\Software\Microsoft
    • {string containing random application}
  • In HKEY_CURRENT_USER\Software\Microsoft
    • {GUID 1}


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