TSPY_DRIDEX.YYSPQ
Trojan.Cridex (Symantec), RDN/Drixed-FBT (McAfee), Win32/Dridex.AA (ESET)
Windows

Threat Type: Spyware
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
This spyware may be downloaded by other malware/grayware from remote sites.
It connects to a website to send and receive information.
It modifies the Internet Explorer Zone Settings.
It steals certain information from the system and/or the user.
It deletes itself after execution.
TECHNICAL DETAILS
184,320 bytes
EXE
Yes
14 Dec 2015
Connects to URLs/IPs, Downloads files
Arrival Details
This spyware may be downloaded by the following malware/grayware from remote sites:
- VBS_BARTALEX.XYVV
It may be downloaded from the following remote site(s):
- http://{BLOCKED}s.net/cute.jpg?WMrnRygZ={random number}
Installation
This spyware drops the following files:
- %AppDataLocalLow%\{random filename}.sdb
- %AppDataLocalLow%\{random filename}.bat
(Note: %AppDataLocalLow% is the protected mode folder of Internet Explorer, where it usually is C:\Users\{user name}\AppData\LocalLow 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.)
It injects codes into the following process(es):
- explorer.exe
Other System Modifications
This spyware adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
CLSID\{GUID}
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
{random} = {encrypted configuration file}
Backdoor Routine
This spyware connects to the following websites to send and receive information:
- {BLOCKED}.{BLOCKED}.56.157:443
- {BLOCKED}.{BLOCKED}.0.224:443
- {BLOCKED}.{BLOCKED}.4.189:443
- {BLOCKED}.{BLOCKED}.8.41:444
- {BLOCKED}.{BLOCKED}.196.55:443
Web Browser Home Page and Search Page Modification
This spyware modifies the Internet Explorer Zone Settings.
Download Routine
This spyware connects to the following URL(s) to download its component file(s):
- https://{BLOCKED}.{BLOCKED}.76.40:3448
- https://{BLOCKED}.{BLOCKED}.152.170:4493
- https://{BLOCKED}.{BLOCKED}.234.136:9943
Information Theft
This spyware steals the following information:
- Online banking/Social networking sites credentials
- Browser screenshots
It gathers the following data:
- Username
- Computer name
- Installation date
- Installed programs and version
Other Details
This spyware deletes itself after execution.
NOTES:
This malware may also perform the following:
- Upload/Download and/or execute files
- Monitor network traffic
- Add infected host to botnet
- Download updated configuration file
- Download and execute modules (VNC)
- Inject itself to web browsers (i.e. IE, Chrome, Firefox)
SOLUTION
9.800
12.210.07
14 Dec 2015
12.211.00
15 Dec 2015
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_DRIDEX.YYSPQ. (Note: Please skip this step if the threat(s) listed below have already been removed.)
- VBS_BARTALEX.XYVV
Step 4
Restart in Safe Mode
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\CLSID\{GUID}\ShellFolder
- {random} = {encrypted configuration file}
- {random} = {encrypted configuration file}
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
- ShellFolder
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\CLSID
- {GUID}
- {GUID}
Step 7
Reset Internet security settings
Step 8
Search and delete this file
- %AppDataLocalLow%\{random filename}.sdb
- %AppDataLocalLow%\{random filename}.bat
Step 9
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_DRIDEX.YYSPQ. 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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