Analysis by: Roland Marco Dela Paz
ALIASES:

Troj/Bredo-FH (Sophos); TrojanDownloader:Win32/Karagany.A (Microsoft)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

This Trojan may be downloaded by other malware/grayware from remote sites.

  TECHNICAL DETAILS

File Size: 44,672 bytes
File Type: PE
Memory Resident: Yes
Initial Samples Received Date: 05 Mar 2011

Arrival Details

This Trojan may be downloaded by the following malware/grayware from remote sites:

  • TROJ_DLOADR.FG

It may be downloaded from the following remote sites:

  • http://{BLOCKED}.{BLOCKED}.73.203/548.exe

Installation

This Trojan drops the following copies of itself into the affected system:

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

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

It drops the following non-malicious files:

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

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

It creates the following folders:

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

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

Autostart Technique

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

  • AdbUpd.lnk

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 7.878.01
FIRST VSAPI PATTERN DATE: 05 Mar 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

Remove malware files dropped/downloaded by TROJ_KARAGANY.AL

Step 3

Identify and terminate files detected as TROJ_KARAGANY.AL

[ Learn More ]
  1. 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.
  2. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 4

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.
  • %User Startup%\AdbUpd.lnk

Step 5

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.
  • %User Profile%\Application Data\Adobe

Step 6

Scan your computer with your Trend Micro product to delete files detected as TROJ_KARAGANY.AL. 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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