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PUA_TOMOS.GA

August 19, 2015
 Analysis by: Sammy Chua
 Modified by: Pearl Charlaine Espejo
 ALIASES:

not-a-virus:Downloader.Win32.Somato.h (Kaspersky); Somoto BetterInstaller (PUA) (Sophos); Win32:Somoto-J [PUP] (Avast)

 PLATFORM:

Windows

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

  • Threat Type: Potentially Unwanted Application

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


This potentially unwanted application arrives as a file that exports the functions of other malware/grayware. It may arrive bundled with malware packages as a malware component. It may arrive as a file that exports functions used by other malware. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It does not have any propagation routine.

It does not have any backdoor routine.

It exports functions used by other malware. It requires its main component to successfully perform its intended routine.

  TECHNICAL DETAILS

File Size:

38,456 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

10 Oct 2013

Arrival Details

This potentially unwanted application arrives as a file that exports the functions of other malware/grayware.

It may arrive bundled with malware packages as a malware component.

It may arrive as a file that exports functions used by other malware.

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

Propagation

This potentially unwanted application does not have any propagation routine.

Backdoor Routine

This potentially unwanted application does not have any backdoor routine.

Other Details

This potentially unwanted application exports functions used by other malware.

It requires its main component to successfully perform its intended routine.

NOTES:

The export functions may be used to do any of the following:

  • Using the value name as a parameter, it can read registry values from the following keys and their subkeys:
    • HKCR
    • HKLM
    • HKCU
    • HKU
    • HKCC
  • Using the dialog box title and the message to be displayed as parameters, it may produce a message box
  • It may return the value "9324"

It does not have rootkit capabilities.

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine:

9.750

SSAPI PATTERN File:

1.647.00

SSAPI PATTERN Date:

06 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

Scan your computer with your Trend Micro product to delete files detected as PUA_TOMOS.GA. 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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