Trojan.Win64.DRIDEX.AM
Trojan:Win32/Dridex.PK!MTB (Microsoft); HEUR:Trojan.Win32.Generic (Kaspersky); Troj/Dridex-ABA (Sophos); Trojan.Win32.Generic!BT (Sunbelt)
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
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
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%\{random characters}\{file name}.exe → legitimate Windows executable
The file name can be any of the .exe files located in %System% directory. - %Application Data%\{random characters}\{executable's dll name}.dll → detected as Trojan.Win64.DRIDEX.AM
- %System%\{random characters}\{file name}.exe → legitimate Windows executable
The file name can be any of the .exe files located in %System% directory. - %System%\{random characters}\{executable's dll name}.dll → detected as Trojan.Win64.DRIDEX.AM
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
It creates the following folders:
- %Application Data%\{random characters}
- %System%\{random characters}
(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).. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
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%\{random characters}\{file name}.exe"
It drops the following file(s) in the Windows User 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).)
Other System Modifications
This Trojan adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
CLSID\{GUID}\ShellFolder
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
CLSID\{GUID}\ShellFolder
{GUID} = {hex values}
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
System
EnableLUA = 0
Information Theft
This Trojan retrieves the following information from the affected system:
- OS Version
- Computer Name
- User Name
- Install Date
- Running Privilege
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 on port 443.
It adds the following scheduled tasks:
- Task name: {random characters}
Trigger: Every 1 hour
Task to be run: %System%\{random characters}\{file name}.exe
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
SOLUTION
Step 1
Trend Micro products with the XGen technology detect this malware as
- Troj.Win32.TRX.XXPE50FFF031
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
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
- {random characters}= "%Application Data%\{random characters}\{file name}.exe"
- {random characters}= "%Application Data%\{random characters}\{file name}.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\CLSID\{GUID}\ShellFolder
- {GUID} = {hex values}
- {GUID} = {hex values}
Step 5
Restore this modified 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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
- From: EnableLUA = 0
To: EnableLUA = 1
- From: EnableLUA = 0
Step 6
Delete this registry key
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\Explorer\CLSID\{GUID}\ShellFolder
- (null)
- (null)
Step 7
Search and delete this file
- %Application Data%\{random characters}\{file name}.exe
- %Application Data%\{random characters}\{executable's dll name}.dll
- %System%\{random characters}\{file name}.exe
- %System%\{random characters}\{executable's dll name}.dll
- %User Startup%\{random characters}.lnk
Step 8
Search and delete these folders
- %Application Data%\{random characters}
- %System%\{random characters}
Step 9
Scan your computer with your Trend Micro product to delete files detected as Trojan.Win64.DRIDEX.AM. 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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