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TROJ_SMALL.NAF

October 10, 2012
 ALIASES:

TrojanDownloader:Win32/Small (Microsoft); Generic Downloader.af (McAfee); Downloader (Symantec); Trojan-Downloader.Win32.Small.azc (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Generic.Malware.dld!!g.EEC1DCFB (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.

  TECHNICAL DETAILS

File Size:

4,609 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

18 Sep 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:

  • %System%\config\servs.exe
  • %Temp%\scs1.tmp
  • %Temp%\scs2.tmp

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

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}47.56/service.exe

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

Scan your computer with your Trend Micro product to delete files detected as TROJ_SMALL.NAF. 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 3

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.

  • %System%\config\servs.exe
  • %Temp%\scs1.tmp
  • %Temp%\scs2.tmp


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