INF_BLACKEN.EXTA

November 04, 2014
 Analysis by: Adrian Cofreros
 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This Trojan may be dropped by other malware.

It is used to load and execute a file.

  TECHNICAL DETAILS

File Size:

422 bytes

File Type:

Other

Initial Samples Received Date:

27 Oct 2014

Arrival Details

This Trojan may be dropped by the following malware:

  • TROJ_MDROP.EXTA

Other System Modifications

This Trojan modifies the following file(s):

  • renames {malware path}\svcmgr.gif to {malware path}\svcmgr.gif.exe

It adds the following registry entries as part of its installation routine:

HKEY_LOCAL_MACHINE\Microsoft\Windows\
CurrentVersion\RunOnce
Install = "{malware path}\svcmgr.gif.exe"

Other Details

This Trojan is used to load and execute the following file:

  • {malware path}\svcmgr.gif.exe - detected as TROJ_DLOADER.EXTA

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

11.254.01

FIRST VSAPI PATTERN DATE:

03 Nov 2014

VSAPI OPR PATTERN File:

11.255.00

VSAPI OPR PATTERN Date:

04 Nov 2014

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Remove the malware/grayware file that dropped/downloaded INF_BLACKEN.EXTA. (Note: Please skip this step if the threat(s) listed below have already been removed.)

    • TROJ_MDROP.EXTA

Step 4

Restart in Safe Mode

[ Learn More ]

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_LOCAL_MACHINE\Microsoft\Windows\CurrentVersion\RunOnce
    • Install = "{malware path}\svcmgr.gif.exe"

Step 6

Search and delete these files

[ Learn More ]
There may be some 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.
  • {malware path}\svcmgr.gif.exe

Step 7

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