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WORM_BEAUGRIT.PX

September 09, 2014
 Analysis by: Vincent Martin Hermosura
 ALIASES:

Trojan.Win32.VB.clad (Kaspersky), Trojan:Win32/Beaugrit.gen!AAA (Microsoft), GenericR-ASX!1DB267243CDA (Mcafee), W32/VBTrojan.17E!Maximus (Authentium), Gen:Trojan.Heur.hm0@fLdHYphi (Bitdefender), W32/VBTrojan.17E!Maximus (Fprot), Win32/VB.OJJ worm (Esset), Generic (Panda), Trojan.VB.gen (Vba32)

 PLATFORM:

Windows

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware, Via physical/removable drives


This worm arrives via removable drives. 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 drops copies of itself in all removable and physical drives found in the system.

  TECHNICAL DETAILS

File Size:

114688 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

06 Sep 2014

Arrival Details

This worm arrives via removable drives.

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

Installation

This worm drops the following copies of itself into the affected system and executes them:

  • %Program Files%\MuAS_Virus.exe

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

Autostart Technique

This worm adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
MuAS_Virus = "%Program Files%\MuAS_Virus.exe"

Propagation

This worm drops copies of itself in all removable and physical drives found in the system.

Other Details

This worm drops the following file(s)/component(s):

  • %Windows%\host
  • {removable drive letter}:\host

(Note: %Windows% is the Windows folder, which is usually C:\Windows.)

NOTES:

The dropped file in %Windows%\hostand {removable drive letter}:\host contains the following strings:

  • -11{date and time of malware propagation}'KasihaN'

This worm uses the legit icon of Microsoft Office to trick users into thinking that it is a legitimate file.

It drops copies of itself in all drives connected to the system. The number of copies is dependent on the number of .DOC files found on the system. It also uses the filename of the .DOC files found in the system. It sets the attributes of the original .DOC files found into as System and Hidden. It does this so that the user sees the copy of malware using the filename, and consequently, tricks into clicking it, thus running the malware.

  SOLUTION

Minimum Scan Engine:

9.300

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

Restart in Safe Mode

[ Learn More ]

Step 4

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\Windows\CurrentVersion\Run
    • MuAS_Virus = "C:\Program Files\MuAS_Virus.exe"

Step 5

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.
  • %Windows%\host
  • {removable drive letter}:\host

Step 6

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