JS_EXJAYSEE.SMA

 Analysis by: Joselyn Canuela

 PLATFORM:

Windows

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It modifies the user's Internet Explorer home page into a certain website. This action allows the malware to point to a website which may contain malware, putting the affected computer at greater risk of malware infection. It modifies the Internet Explorer Zone Settings.

  TECHNICAL DETAILS

File Size:

28,056 bytes

File Type:

JS

Memory Resident:

No

Initial Samples Received Date:

24 Aug 2015

Arrival Details

This worm 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 worm adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
JSEFile\DefaultIcon
{Default} = "%System%\imageres.dll,-72"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
JSEFile
FriendlyTypeName = "%System%\shell32.dll,-30596"

Propagation

This worm drops the following copy(ies) of itself in all removable drives:

  • {Drive Letter}:\SAM_17122.JPG.jse

Web Browser Home Page and Search Page Modification

This worm modifies the user's Internet Explorer home page to the following websites:

  • https://www.{BLOCKED}e.es/#output=search&sclient=psy-ab&q=fiverdolly+28056

It modifies the Internet Explorer Zone Settings.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

11.882.04

FIRST VSAPI PATTERN DATE:

27 Aug 2015

VSAPI OPR PATTERN File:

11.883.00

VSAPI OPR PATTERN Date:

28 Aug 2015

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

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\SOFTWARE\Classes\JSEFile\DefaultIcon
    • {Default} = "%System%\imageres.dll,-72"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\JSEFile
    • FriendlyTypeName = "%System%\shell32.dll,-30596"

Step 4

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.
  • {Drive Letter}:\SAM_17122.JPG.jse

Step 5

Reset the Internet Explorer Home and Search pages

[ Learn More ]

Step 6

Reset Internet privacy settings

[ Learn More ]

Step 7

Scan your computer with your Trend Micro product to delete files detected as JS_EXJAYSEE.SMA. 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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