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Worm.Win32.NEGASTEAL.B

December 16, 2019
 Analysis by: Jay Garcia
 ALIASES:

Backdoor.Win32.Androm.todo (Kaspersky); Trojan.Autoit, Trojan.Autoit, Trojan.Autoit (Ikarus)

 PLATFORM:

Windows

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


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.

  TECHNICAL DETAILS

File Size:

1,473,024 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

01 Dec 2019

Payload:

Connects to URLs/IPs, Steals information

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.

Installation

This Worm drops the following copies of itself into the affected system:

  • %Application Data%\NewApp\NewApp.exe

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Autostart Technique

This Worm modifies the following registry entries to ensure it automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
NewApp = %Application Data%\NewApp\NewApp.exe

Propagation

This Worm drops the following copies of itself in all physical and removable drives:

  • {drive letter}:\{GUID}.exe

Information Theft

This Worm gathers the following data:

  • User Name
  • Computer Name
  • OS Name
  • OS Version Platform
  • OS Version
  • Processor Name
  • Amount of Physical Memory
  • Username and Password from the following applications:
    • 360 Browser
    • 7Star
    • Amigo
    • BlackHawk
    • Brave Browser
    • CentBrowser
    • Chedot
    • Chrome
    • Chromium
    • Citrio
    • Claws-mail
    • CocCoc
    • Comodo Dragon
    • CoolNovo
    • Coowon
    • CoreFTP
    • CyberFox
    • DynDNS
    • Edge
    • Elements Browser
    • Epic Privacy Browser
    • Eudora
    • Firefox
    • FlashFXP
    • Flock
    • Foxmail
    • FTPCommander
    • FTPGetter
    • FTP Navigator
    • IceCat
    • IceDragon
    • IncrediMail
    • Internet Download Manager
    • Internet Explorer
    • Ipswitch
    • Iridium Browser
    • jDownloader
    • K-Meleon
    • Kometa
    • Liebao Browser
    • Mozilla
    • No-IP
    • OpenVPN
    • Opera Browser
    • Opera Mail
    • Orbitum
    • Outlook
    • PaleMoon
    • Paltalk
    • Pidgin
    • Pocomail
    • Postbox
    • Psi/Psi+
    • QIP Surf
    • QQ Browser
    • RimArts
    • Safari
    • SeaMonkey
    • Sleipnir 6
    • SmartFTP
    • Sputnik
    • SRWare Iron
    • The Bat!
    • Thunderbird
    • Torch Browser
    • Trillian
    • UC Browser
    • uCozMedia
    • Uran
    • Vitalwerks
    • Vivaldi
    • WaterFox
    • Wi-Fi
    • WinSCP
    • WS_FTP
    • Yandex Browser

Stolen Information

This Worm sends the data it gathers to the following email addresses via SMTP:

  • {BLOCKED}pera@{BLOCKED}thospitals.org

Other Details

This Worm does the following:

  • It drops .lnk files in the removable drives using the names of the folders/files located on the said drives as filenames. It then hides the original folders/files to trick users on opening the file.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

15.558.03

FIRST VSAPI PATTERN DATE:

14 Dec 2019

VSAPI OPR PATTERN File:

15.559.00

VSAPI OPR PATTERN Date:

15 Dec 2019

Step 1

Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:

     
    • Troj.Win32.TRX.XXPE50FFF033

Step 2

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 3

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 4

Restart in Safe Mode

[ Learn More ]

Step 5

Delete this registry key

[ 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
    • NewApp = %Application Data%\NewApp\NewApp.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.
  • %Application Data%\NewApp\NewApp.exe
  • {drive letter}:\{GUID}.exe

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as Worm.Win32.NEGASTEAL.B. 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.

Step 8

Scan your computer with your Trend Micro product to delete files detected as Worm.Win32.NEGASTEAL.B. 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 the following Trend Micro Support pages for more information:


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