arrow_back
search
close

TROJ_SMALL.API

October 12, 2012
 ALIASES:

BrowserModifier:Win32/AFAInternetEnhancement, TrojanDownloader:Win32/Small (Microsoft); [2.nsis]:Generic.cb, [3.nsis]:Downloader-ZF (McAfee); Trojan.Startpage (Symantec); ARC:NSIS, [QBTool.exe]:Trojan.Win32.Registrator.b, [QB.exe]:Trojan-Downloader.Win32.Small.aly (Kaspersky); AFA Internet Enhancement, Trojan-Downloader.Win32.Tiny!cobra (v) (Sunbelt); Dropped:Trojan.Generic.44888 (FSecure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • 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.

It disables Task Manager, Registry Editor, and Folder Options.

  TECHNICAL DETAILS

File Size:

38,005 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

02 May 2012

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 deletes the following files:

  • %User Temp%\nsp1.tmp

(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 adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run

It creates the following registry entry(ies) to disable Task Manager, Registry Tools and Folder Options:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run
kcaxia.exe = "%System%\kcaxia.exe"

Dropping Routine

This Trojan drops the following files:

  • %System%\QBTool.exe
  • %System%\QB.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://media.{BLOCKED}nners.com/advertpro/servlet/view/dynamic/html/media?mid=203&pid=0
  • http://apps.{BLOCKED}zz.com/QB6/AddNewSoft.txt

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.200

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

Enable Registry Editor, Task Manager, and Folder options

[ Learn More ]
By doing this step, you also enable other applications/programs disabled by this malware/grayware.

Step 3

Delete this registry key

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
    • Run

Step 4

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.
  • %System%\QBTool.exe
  • %System%\QB.exe

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_SMALL.API. 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 6

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %User Temp%\nsp1.tmp


Did this description help? Tell us how we did.