TSPY_EMOTET.J
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted:
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 deletes itself after execution.
TECHNICAL DETAILS
114,688 bytes
EXE
Yes
12 Jun 2014
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.
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
jswbios.exe = "%User Profile%\Microsoft\jswbios.exe"
Other System Modifications
This Trojan deletes the following files:
- %User Profile%\Microsoft\jswbios.exe:Zone.Identifier
- %User Profile%\APPLIC~1\27372.bat
- %User Profile%\Microsoft\plugin.txt
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
It adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Office\Common\BB353704\
BB353704RS
HKEY_CURRENT_USER\Software\Microsoft\
Office\Common\BB353704\
BB353704SS
HKEY_CURRENT_USER\Software\Microsoft\
Office\Common\BB353704\
BB353704PS
HKEY_CURRENT_USER\Software\Microsoft\
Office\Common\BB353704\
BB353704CS
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Office\Common\BB353704\
BB353704SS
01 = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Office\Common\BB353704\
BB353704SS
02 = "{random values}"
Dropping Routine
This Trojan drops the following files:
- %User Profile%\Microsoft\jswbios.exe
- %User Profile%\Application Data\27372.bat
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}.25.23
- {BLOCKED}.183.196
- {BLOCKED}218.166
- {BLOCKED}69.191
It deletes itself after execution.
This report is generated via an automated analysis system.
SOLUTION
9.700
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
Restart in Safe Mode
Step 3
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\Office\Common\BB353704
- BB353704RS
- In HKEY_CURRENT_USER\Software\Microsoft\Office\Common\BB353704
- BB353704SS
- In HKEY_CURRENT_USER\Software\Microsoft\Office\Common\BB353704
- BB353704PS
- In HKEY_CURRENT_USER\Software\Microsoft\Office\Common\BB353704
- BB353704CS
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
- jswbios.exe = "%User Profile%\Microsoft\jswbios.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Office\Common\BB353704\BB353704SS
- 01 = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Office\Common\BB353704\BB353704SS
- 02 = "{random values}"
Step 5
Search and delete these components
- %User Profile%\Microsoft\jswbios.exe
- %User Profile%\Application Data\27372.bat
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_EMOTET.J. 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.
Step 7
Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.
- %User Profile%\Microsoft\jswbios.exe:Zone.Identifier
- %User Profile%\APPLIC~1\27372.bat
- %User Profile%\Microsoft\plugin.txt
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