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Threat Encyclopedia

TROJ_TRACUR.SMB

ANALYSIS BY

Christopher Daniel So


ALIASES:

TrojanDownloader.Win32.Tracur.a (Sunbelt)

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

TECHNICAL DETAILS

SOLUTION

Minimum Scan Engine:

8.900

VSAPI OPR PATTERN File:

8.123.00

VSAPI OPR PATTERN Date:

27 Apr 2011

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Remove the malware/grayware file dropped/downloaded by TROJ_TRACUR.SMB

    TROJ_TRACUR.SMA
    TROJ_TRACUR.SMB

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

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_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
    • HidServ32
  • In HKEY_CLASSES_ROOT
    • .fsharproj
  • In HKEY_CLASSES_ROOT
    • Cfbbbjkdkl

Step 5

Delete this registry value

[ 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\Internet Explorer\Main
    • XMLHTTP_UUID_Default={random values}
  • In HKEY_CURRENT_USER\Identities
    • Curr version=35
  • In HKEY_CURRENT_USER\Identities
    • Last Date={last date of execution}
  • In HKEY_CURRENT_USER\Identities
    • Send Inst=ok
  • In HKEY_CURRENT_USER\Identities
    • Inst Date={installation date}
  • In HKEY_CURRENT_USER\Identities
    • Popup count=0
  • In HKEY_CURRENT_USER\Identities
    • Popup time=0
  • In HKEY_CURRENT_USER\Identities
    • Popup date=0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer
    • 982bc1da={random values}
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List
    • %System%\{random file name}.exe=%System%\{random file name}.exe:*:Enabled:Windows Update Service
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • %System%\{random file name}.exe=%System%\{random file name}.exe:*:Enabled:Windows Update Service

Step 6

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\SysWin

Step 7

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%\unrar.exe
%System%\{random folder}\frt{random number}.rar

Step 8

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_TRACUR.SMB. 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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