TrojanSpy.Win32.EMOTET.TIABOFFM
Trojan:Win32/Emotet!MTB (Microsoft); Trojan-Banker.Win32.Trickster.glb (Kaspersky)
Windows
Threat Type: Trojan Spy
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
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.
However, as of this writing, the said sites are inaccessible. It deletes itself after execution.
TECHNICAL DETAILS
647,186 bytes
EXE
Yes
10 Dec 2019
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 copies of itself into the affected system:
- %System%\{random string}{random string}.exe - if run with admin rights
- %AppDataLocal%\{random string}{random string}\{random string}{random string}.exe - if run without admin rights
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
Autostart Technique
This Trojan Spy registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{random string}{random string}
ImagePath = "%System%\{random string}{random string}.exe"
It adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random string}{random string} = %AppDataLocal%\{random string}{random string}\{random string}{random string}.exe
Other System Modifications
This Trojan Spy adds the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{random string}{random string}
DisplayName = "{random string}{random string}"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{random string}{random string}
Start = "SERVICE_AUTO_START"
Other Details
This Trojan Spy connects to the following possibly malicious URL:
- http://{BLOCKED}.{BLOCKED}.190.235:443/tNnirbMxcPVxYiX9z
However, as of this writing, the said sites are inaccessible.
It deletes itself after execution.
SOLUTION
9.850
15.550.03
10 Dec 2019
15.551.00
11 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
Identify and terminate files detected as TrojanSpy.Win32.EMOTET.TIABOFFM
- 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 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_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\{random string}{random string}
- ImagePath = "%System%\{random string}{random string}.exe"
- ImagePath = "%System%\{random string}{random string}.exe"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\{random string}{random string}
- DisplayName = "{random string}{random string}"
- DisplayName = "{random string}{random string}"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\{random string}{random string}
- Start = "SERVICE_AUTO_START"
- Start = "SERVICE_AUTO_START"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- {random string}{random string} = %AppDataLocal%\{random string}{random string}\{random string}{random string}.exe
- {random string}{random string} = %AppDataLocal%\{random string}{random string}\{random string}{random string}.exe
Step 6
Search and delete these files
- %System%\{random string}{random string}.exe
- %AppDataLocal%\{random string}{random string}\{random string}{random string}.exe
Step 7
Scan your computer with your Trend Micro product to delete files detected as TrojanSpy.Win32.EMOTET.TIABOFFM. 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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