TROJ_RUCKGUV.PWT
TrojanDownloader:Win32/Ruckguv.A (Microsoft)
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
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 executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system. As of this writing, the said sites are inaccessible.
It deletes itself after execution.
TECHNICAL DETAILS
119,912 bytes
EXE
No
21 Apr 2015
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.
Installation
This Trojan adds the following processes:
- svchost.exe
Other System Modifications
This Trojan adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion
path = {malware file path}\{malware file name}
Download Routine
This Trojan downloads the file from the following URL and renames the file when stored in the affected system:
- https://{BLOCKED}esteward.com/css/Document1704.exe
It saves the files it downloads using the following names:
- %Application Data%\csrss_{random number}.exe
- %Application Data%\Frifox_{random number}.exe
- %Application Data%\WindowsDriver_{random number}.exe
(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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 then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.
As of this writing, the said sites are inaccessible.
Other Details
This Trojan deletes itself after execution.
NOTES:
It does not have rootkit capabilities.
It does not exploit any vulnerability.
SOLUTION
9.750
11.626.01
24 Apr 2015
11.627.00
25 Apr 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
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
- path = {malware file path}\{malware file name}
- path = {malware file path}\{malware file name}
Step 4
Search and delete these files
- %Application Data%\csrss_{random number}.exe
- %Application Data%\Frifox_{random number}.exe
- %Application Data%\WindowsDriver_{random number}.exe
Step 5
Scan your computer with your Trend Micro product to delete files detected as TROJ_RUCKGUV.PWT. 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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