WORM_NECAST.K
W32/Palevo-BZ (Sophos) ,Worm/Generic2.AXRQ (AVG) ,W32/MSIL_Agent.K.gen!Eldorado (generic, not disinfectable) (Fprot) ,Worm.Win32.Msil (Ikarus) ,Worm.MSIL.Agent.js (Kaspersky) ,Worm:MSIL/Necast.F (Microsoft) ,Generic Malware.og!ats (McAfee) ,MSIL/Agent.AY worm (Eset) ,Infostealer (Symantec) ,Trj/Sinowal.WWG (Panda) ,Trojan.Win32.Generic!BT (Sunbelt)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

Threat Type: Worm
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Propagates via removable drives, Dropped by other malware, Downloaded from the Internet
This worm arrives by connecting affected removable drives to a system. 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 retrieves specific information from the affected system.
TECHNICAL DETAILS
102,400 bytes
EXE
Yes
03 Mar 2014
Steals information
Arrival Details
This worm arrives by connecting affected removable drives to a system.
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:
- %Windows%\system\svchost..exe (For Windows XP and prior)
- %User Profile%\Documents\suchost..exe (For Windows Vista and later)
(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
Autostart Technique
This worm drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:
- %User Startup%\svchost..exe
(Note: %User Startup% is the current user's Startup folder, which is usually C:\Documents and Settings\{user}\Start Menu\Programs\Startup on Windows 2000 and XP, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)
Propagation
This worm drops the following copy(ies) of itself in all removable drives:
- movies.exe
Information Theft
This worm retrieves the following information from the affected system:
- Filenames of all .JPG files found in local drives
- Filenames of all .XLSX files found in local drives
- Filenames of all .DOCX files found in local drives
Stolen Information
The stolen information is saved in the following file:
- %System Root%\Users\Public\Documents\wsystem.vx (For Windows Vista and later)
- %Windows%\system\wsystem.vx (For Windows XP and prior)
(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)
It sends the data it gathers to the following email addresses via SMTP:
- {BLOCKED}iler411@gmail.com
NOTES:
It connects to the following SMTP server to send the stolen information:
- smtp.gmail.com - Port: 587
It uses the following email credentials to log in the SMTP server:
- user: {BLOCKED}iler411@gmail.com
- password: benhurdavies20
The email it send may contain the following information:
- From: {BLOCKED}iler411@gmail.com
- To: {BLOCKED}iler411@gmail.com
- Subject: {Username of Infected Machine}
- Attachment: wsystem.vx
- body: mac address : {mac address of infected machine}
- file path : {target drive in stealing information}
SOLUTION
9.700
10.640.03
03 Mar 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
Identify and terminate files detected as WORM_NECAST.K
- Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
- If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
Step 3
Search and delete this file
Step 4
Scan your computer with your Trend Micro product to delete files detected as WORM_NECAST.K. 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.
Did this description help? Tell us how we did.