Trojan:Win32/Bulta!rfn (Microsoft); Troj/Upatre-SQ (Sophos)
Windows
This spyware may be dropped by other malware.
It uses the Windows Task Scheduler to add a scheduled task that executes the copies it drops.
It does not have any propagation routine.
It connects to certain websites to send and receive information. It deletes itself after execution.
Arrival Details
This spyware may be dropped by the following malware:
Installation
This spyware drops the following copies of itself into the affected system:
(Note: %AppDataLocal% is the Application Data folder found in Local Settings, where it is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)
It uses the Windows Task Scheduler to add a scheduled task that executes the copies it drops.
It adds the following mutexes to ensure that only one of its copies runs at any one time:
It injects codes into the following process(es):
Autostart Technique
The scheduled task executes the malware every:
Other System Modifications
This spyware modifies the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\Lsa
LimitBlankPasswordUse = "0"
(Note: The default value data of the said registry entry is 1.)
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\Terminal Server
fDenyTSConnections = "0"
(Note: The default value data of the said registry entry is 1.)
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\Terminal Server
fSingleSessionPerUser = "0"
(Note: The default value data of the said registry entry is 1.)
Propagation
This spyware does not have any propagation routine.
Dropping Routine
This spyware drops the following files:
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %AppDataLocal% is the Application Data folder found in Local Settings, where it is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
Information Theft
This spyware gathers the following data:
Other Details
This spyware connects to the following URL(s) to check for an Internet connection:
It connects to the following URL(s) to get the affected system's IP address:
It connects to the following website to send and receive information:
It does the following:
It deletes itself after execution.
NOTES:
This spyware steals important banking/bitcoin information by injecting malicious codes to bank/Bitcoin login webpages with URLs containing any of the following:
The following are the proxy addresses used for man-in-the-middle attacks:
It sends the following GET request:
It sends a POST request to send stolen information from the injection.
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
Remove the malware/grayware file that dropped/downloaded TSPY_DYRE.YSR. (Note: Please skip this step if the threat(s) listed below have already been removed.)
Step 4
Restart in Safe Mode
Step 5
Search and delete these files
Step 6
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.
Step 7
Delete the Scheduled Tasks added by this malware/grayware
To delete the added Scheduled Task file:
For Windows 2000, Windows XP, and Windows Server 2003:
For Windows Vista, Windows 7, Windows Server 2008, Windows 8, Windows 8.1, and Windows Server 2012:
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_DYRE.YSR. 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.