TSPY_EMOTET.THHAOAH
Trojan:Win32/Emotet.AC!bit (Microsoft) ; Trojan-Banker.Win32.Emotet.banh (Kaspersky) ;a variant of Win32/Kryptik.GJSB (ESET-NOD32)
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.
TECHNICAL DETAILS
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 and executes them:
- %System%\{random file name}.exe -> Drop when file is run with admin rights
- %AppDataLocal%\Microsoft\Windows\{random file name}.exe -> Drop when file is 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, XP, and Server 2003, or C:\Users\{user name}\AppData\Local on Windows Vista, 7, and 8.)
It adds the following processes:
- %AppDataLocal%\Microsoft\Windows\{random file name}.exe
- %System%\{random file name}.exe
(Note: %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local on Windows Vista, 7, and 8.. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
Autostart Technique
This Trojan Spy adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
CurrentVersion\Run
{random file name} = %AppDataLocal%\Microsoft\Windows\{random file name}.exe
It starts the following services:
- Service Name: {random file name}
- Description: Processes installation, removal, and enumerations requests for software deployed through Group Policy, If the service is disabled, users will be unable to install, remove, or enumerate software deployed through Group Policy. If this service is disabled, any services that explicitly depends on it will fail to start.
- Image Path: %System%\{random file name}.exe
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
Other Details
This Trojan Spy connects to the following possibly malicious URL:
- http://{BLOCKED}.{BLOCKED}.58.168/
- http://{BLOCKED}.{BLOCKED}.168.27/
SOLUTION
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
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 3
Restart in Safe Mode, and then 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_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services
- {random file name}
- {random file name}
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\CurrentVersion\Run
- {random file name} = "%AppDataLocal%\Microsoft\Windows\{random file name}.exe"
- {random file name} = "%AppDataLocal%\Microsoft\Windows\{random file name}.exe"
Step 5
Search and delete these files
- %AppDataLocal%\Microsoft\Windows\{random file name}.exe
- %System%\{random file name}.exe
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_EMOTET.THHAOAH. 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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