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TROJ_SMALLTR.AOL

October 08, 2012
 Analysis by: Michael Cabel
 PLATFORM:

Windows 2000, XP, 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 may be downloaded by other malware/grayware/spyware from remote sites. It arrives as a component bundled with malware/grayware packages.

  TECHNICAL DETAILS

File Size:

2,301,952 bytes

File Type:

PE

Memory Resident:

No

Initial Samples Received Date:

02 Sep 2010

Payload:

Connects to URLs/Ips, Drops files

Arrival Details

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

It arrives as a component bundled with malware/grayware packages.

Installation

This Trojan adds the following folders:

  • %Current Folder%\plugin

It drops the following file(s)/component(s):

  • %Windows%\{Random File Name}.dll - detected as TROJ_ADCLICKR.FW

(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)

It drops the following non-malicious files:

  • %Current Folder%\plugin\Window.dll
  • %Current Folder%\plugin\Memory.dll
  • %Current Folder%\plugin\GetSysInfo.dll
  • %Current Folder%\plugin\File.dll
  • %Current Folder%\plugin\Console.dll
  • %Current Folder%\plugin\BkgndColor.dll
  • %Current Folder%\eula-mymacro-full.txt
  • %Current Folder%\yrkaeou.dll
  • %Current Folder%\rename.ini
  • %Current Folder%\cooper.dll
  • %Current Folder%\ad-mymacro.xml

Other Details

This Trojan does the following:

  • It registers its dropped .DLL file, detected as TROJ_ADCLICKER.FW. As such, routines of the said file are exhibited on the affected system.
  • It attempts to establish a connection to the following remote host:
    • {BLOCKED}.{BLOCKED}.238.241
  • It attempts to access the following websites upon execution:
    • http://{BLOCKED}rothers.com/qmacro/ad-mymacro-cht.xml
    • http://{BLOCKED}rothers.com/qmacro/ad-mymacro-cht.htm

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI OPR PATTERN File:

7.432.04

VSAPI OPR PATTERN Date:

02 Sep 2010

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.
  • %Windows%\{Random File Name}.dll
  • %Current Folder%\eula-mymacro-full.txt
  • %Current Folder%\cooper.dll
  • %Current Folder%\rename.ini
  • %Current Folder%\yrkaeou.dll
  • %Current Folder%\ad-mymacro.xml

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_SMALLTR.AOL. 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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