Trojan.Win64.DRIDEX.GR
Trojan:Win64/Dridex.DHB!MTB (MICROSOFT); Trojan-Spy.Agent (IKARUS)
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
This Trojan 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
1,015,808 bytes
DLL
Yes
01 May 2020
Drops files, Steals information
Arrival Details
This Trojan 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 drops the following files:
- %Application Data%\{Existing Folder}\{random characters}\{file name}.exe - legitimate Windows executable
- %Application Data%\{Existing Folder}\{random characters}\{executable's dll name}.dll - modified copy of itself
(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 creates the following folders:
- %Application Data%\{Existing Folder}\{random characters}\ - where existing folders can be any folder within the subdirectories of %Application Data%
(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 mutexes to ensure that only one of its copies runs at any one time:
- {hash of computer name and user name}
It injects codes into the following process(es):
- explorer.exe
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Olxdkxkrdtg = "%Application Data%\{Existing Folder}\{random characters}\{file name}.exe"
It drops the following file(s) in the Windows Startup folder to enable its automatic execution at every system startup:
- %User Startup%\{random characters}.lnk
(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows 2003(32-bit), XP and 2000(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit), 10(64-bit).)
Information Theft
This Trojan retrieves the following information from the affected system:
- OS Version
- Computer Name
- User Name
- Install Date
- Running Privilege
- UAC Configurations
- Machine GUID
- System Information
Other Details
This Trojan does the following:
- It executes the following command to bypass Windows Firewall:
- netsh advfirewall firewall add rule name="Core Networking - Multicast Listener Done (ICMPv4-In)" program="C:\Windows\Explorer.EXE" dir=in action=allow protocol=TCP localport=any - allows explorer.exe to listen on any port
- It listens to port 443
- It tries to spawn legitimate binaries from %System% directory and inject its malicious code
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
It adds the following scheduled tasks:
- Task name: {random characters}
- Trigger: Repeat Every 30 mins indefinitely
- Task to be run: %Application Data%\{Existing Folder}\{Random Characters}\{file name}.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
9.850
15.840.04
01 May 2020
15.841.00
02 May 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.XXPE50FFF035
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
Step 5
Delete this registry value
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
- Olxdkxkrdtg = "%Application Data%\{Existing Folder}\{random characters}\{file name}.exe"
- Olxdkxkrdtg = "%Application Data%\{Existing Folder}\{random characters}\{file name}.exe"
Step 6
Search and delete these files
- %Application Data%\{Existing Folder}\{random characters}\{file name}.exe
- %Application Data%\{Existing Folder}\{random characters}\{executable's dll name}.dll
- %User Startup%\{random characters}.lnk
Step 7
Search and delete this folder
- %Application Data%\{Existing Folder}\{random characters}\{file name}.exe
Step 8
Deleting Scheduled Tasks
The following {Task Name} - {Task to be run} listed should be used in the steps identified below:
- Task name: {random characters}
- Task to be run: %Application Data%\{Existing Folder}\{Random Characters}\{file name}.exe
For Windows 2000, Windows XP, and Windows Server 2003:
- Open the Windows Scheduled Tasks. Click Start>Programs>Accessories>
System Tools>Scheduled Tasks. - Locate each {Task Name} values listed above in the Name column.
- Right-click on the said file(s) with the aforementioned value.
- Click on Properties. In the Run field, check for the listed {Task to be run}.
- 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:
- 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. - In the left panel, click Task Scheduler Library.
- In the upper-middle panel, locate each {Task Name} values listed above in the Name column.
- In the lower-middle panel, click the Actions tab. In the Details column, check for the {Task to be run} string.
- If the said string is found, delete the task.
Step 9
Restart in normal mode and scan your computer with your Trend Micro product for files detected as Trojan.Win64.DRIDEX.GR. 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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