Analysis by: Clive Fuentebella
ALIASES:

HEUR:Trojan-PSW.MSIL.Agensla.gen (KASPERSKY)

 PLATFORM:

Windows

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

  • Threat Type: Trojan Spy

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet

This Trojan Spy 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: 524,288 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 11 Jun 2020

Arrival Details

This Trojan Spy 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 Trojan Spy drops the following files:

  • %User Temp%\tmp{Random characters}.tmp (XML version of created scheduled task)

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

It drops the following copies of itself into the affected system:

  • %Application Data%\{Random characters}.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).)

It adds the following processes:

  • {Malware file name and path} "{path}"
  • "%System%\schtasks.exe" /Create /TN "Updates\{Random characters}" /XML "%User Temp%\tmp{Random characters}.tmp"

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

It terminates the execution of the copy it initially executed and executes the copy it drops instead.

Other System Modifications

This Trojan Spy deletes the following files:

  • %User Temp%\tmp{Random characters}.tmp

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

Information Theft

This Trojan Spy gathers the following data:

  • Amount of memory
  • Clipboard data
  • Computer name
  • MAC Address
  • Motherboard information
  • OS name
  • Processor information
  • Username
  • Credentials from the following applications:
    • 360 Browser
    • 7Star
    • Amigo
    • Apple
    • Becky!
    • BlackHawk
    • Brave
    • CentBrowser
    • Chedot
    • Chrome
    • Chromium
    • Citrio
    • ClawsMail
    • Coccoc
    • Comodo Dragon
    • Cool Novo
    • Coowon
    • CoreFTP
    • CyberFox
    • DynDNS
    • Elements
    • Epic Privacy
    • Eudora
    • Firefox
    • Foxmail
    • FTP Navigator
    • FTPCommander
    • FTPGetter
    • IceCat
    • IceDragon
    • IncrediMail
    • Internet Download Manager
    • Iridium
    • jDownloader
    • K-Meleon
    • Kometa
    • Liebao
    • Microsoft Edge
    • NO-IP
    • OpenVPN
    • Opera
    • Orbitum
    • Outlook
    • PaleMoon
    • Paltalk
    • Pocomail
    • Postbox
    • Psi
    • QIP Surf
    • QQBrowser
    • SeaMonkey
    • Sleipnir 6
    • SmartFTP
    • Sputnik
    • TheBat
    • Thunderbird
    • Torch
    • Trillian
    • UCBrowser
    • Uran
    • Vivaldi
    • WaterFox
    • Web Credentials
    • Windows Credential Picker Protector
    • Windows Credentials
    • Windows Domain Certificate Credential
    • Windows Domain Password Credential
    • Windows Extended Credential
    • Windows Secure Note
    • Windows Web Password Credential
    • WinSCP
    • WS_FTP
    • Yandex

Stolen Information

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

  • {BLOCKED}ogs@kbbsthai.com

Other Details

This Trojan Spy adds the following scheduled tasks:

  • Name: \Updates\{Random characters}
    Trigger: At log on, at task creation/modification
    Action: Run %Application Data%\{Random characters}.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).)

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 15.924.03
FIRST VSAPI PATTERN DATE: 11 Jun 2020
VSAPI OPR PATTERN File: 15.925.00
VSAPI OPR PATTERN Date: 12 Jun 2020

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.XXPE50FFF036

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

Deleting Scheduled Tasks

The following {Task Name} - {Task to be run} listed should be used in the steps identified below:

  • Task name: \Updates\{Random characters}
    Task to be run: %Application Data%\{Random characters}.exe

For Windows 2000, Windows XP, and Windows Server 2003:

  1. Open the Windows Scheduled Tasks. Click Start>Programs>Accessories>
    System Tools>Scheduled Tasks.
  2. Locate each {Task Name} values listed above in the Name column.
  3. Right-click on the said file(s) with the aforementioned value.
  4. Click on Properties. In the Run field, check for the listed {Task to be run}.
  5. If the strings match the list above, delete the task.

For Windows Vista, Windows 7, Windows Server 2008, Windows 8, Windows 8.1, and Windows Server 2012:

  1. Open the Windows Task Scheduler. To do this:
    • On Windows Vista, Windows 7, and Windows Server 2008, click Start, type taskschd.msc in the Search input field, then press Enter.
    • On Windows 8, Windows 8.1, and Windows Server 2012, right-click on the lower left corner of the screen, click Run, type taskschd.msc, then press Enter.
  2. In the left panel, click Task Scheduler Library.
  3. In the upper-middle panel, locate each {Task Name} values listed above in the Name column.
  4. In the lower-middle panel, click the Actions tab. In the Details column, check for the {Task to be run} string.
  5. If the said string is found, delete the task.

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%\{Random characters}.exe
  • %User Temp%\tmp{Random characters}.tmp

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TrojanSpy.MSIL.NEGASTEAL.DYSGWI. 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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