➔
search
✕

TROJ_DLOADR.ZZE

October 08, 2012
 Analysis by: Michael Cabel
 ALIASES:

Trojan.FakeAV (Symantec); TrojanDownloader:Win32/Karagany.A (Microsoft); Trojan-Spy.Win32.SpyEyes.fpv (Kaspersky)

 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 as an attachment to email messages spammed by other malware/grayware or malicious users.

  TECHNICAL DETAILS

File Size:

53,248 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

26 Mar 2011

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

Installation

This Trojan drops the following non-malicious files:

  • %Application Data%\Adobe\AdobeUtil .exe
  • %Application Data%\Adobe\adb.cer

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)

It drops the following copies of itself into the affected system:

  • %Application Data%\Adobe\AdobeUtil.exe
  • {malware path}\err.log{random number}

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)

It creates the following folders:

  • %Application Data%\Adobe\shed
  • %Application Data%\Adobe\plugs

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)

Autostart Technique

This Trojan drops the following file(s) in the Windows Common Startup folder to enable its automatic execution at every system startup:

  • %Startup Folder%\AdbUpd.lnk

Other Details

This Trojan connects to the following possibly malicious URL:

  • {BLOCKED}tefiles.com
  • {BLOCKED}ongt.com
  • {BLOCKED}ska.com
  • {BLOCKED}go.com
  • {BLOCKED}34gsafwe.com
  • {BLOCKED}arfrgad.com
  • {BLOCKED}34gsafwe.com

NOTES:

This Trojan replaces the initially executed file with a normal file immediately after execution to avoid easy detection.

  SOLUTION

Minimum Scan Engine:

8.900

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

Identify and terminate files detected as TROJ_DLOADR.ZZE

[ Learn More ]
  1. For Windows 98 and ME users, Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3

Search and delete this file

[ 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.
  • %Application Data%\Adobe\AdobeUtil .exe
  • %Application Data%\Adobe\adb.cer
  • %Startup Folder%\AdbUpd.lnk

Step 4

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %Application Data%\Adobe\plugs
  • %Application Data%\Adobe\shed

Step 5

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


Did this description help? Tell us how we did.