TROJ_DLOADR.AUSUMS
Windows
![](/vinfo/imgFiles/legend.jpg)
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.
As of this writing, the said sites are inaccessible.
It terminates itself if it detects it is being run in a virtual environment.
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 adds the following folders:
- %Application Data%\Microsoft\Windows\{random folder name}
(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, and 8.)
It drops a copy of itself in the following folders using different file names:
- %Application Data%\Microsoft\Windows\{random folder name}\{random filename}.exe
(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, and 8.)
It drops and executes the following files:
- %User Temp%\allradio_4.27_portable.exe - bundled application
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, and 8.)
It injects codes into the following process(es):
- explorer.exe
Autostart Technique
This Trojan drops the following shortcut pointing to its copy in the User Startup folder to enable its automatic execution at every system startup:
- %Start Menu%\Programs\Startup\{random filename}.lnk
(Note: %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on Windows Vista, 7, and 8.)
Download Routine
This Trojan connects to the following website(s) to download and execute a malicious file:
- http://{BLOCKED}r33r.net/
- http://{BLOCKED}iti.net/
- http://{BLOCKED}biberpiror.net/
- http://{BLOCKED}ino.net/
- http://{BLOCKED}xtuy.net/
- http://{BLOCKED}inu.net/
- http://{BLOCKED}nopelletua.top/
It saves the files it downloads using the following names:
- %Application Data%\Microsoft\Windows\{random folder name}\{random filename}
(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, and 8.)
As of this writing, the said sites are inaccessible.
Other Details
This Trojan connects to the following URL(s) to check for an Internet connection:
- http://www.msftncsi.com/ncsi.txt
It terminates itself if it detects it is being run in a virtual environment.
It adds the following scheduled tasks:
- Task Name: Opera scheduled Autoupdate 4086469641
Task to run: %Application Data%\Microsoft\Windows\{random folder name}\{random filename}.exe (malware copy)
Schedule: Every 10 minutes
(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, and 8.)
SOLUTION
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
Restart in Safe Mode
Step 4
Deleting Scheduled Tasks
The following {Task Name} - {Task to be run} listed should be used in the steps identified below:
- Task Name: Opera scheduled Autoupdate 4086469641
- Task to run: %Application Data%\Microsoft\Windows\{random folder name}\{random filename}.exe
For Windows 2000, Windows XP, and Windows Server 2003:
- Open the Windows Scheduled Tasks. Click Start>Programs>Accessories>
System Tools>Scheduled Tasks. - Locate each {Task Name} values listed above in the Name column.
- Right-click on the said file(s) with the aforementioned value.
- Click on Properties. In the Run field, check for the listed {Task to be run}.
- If the strings match the list above, delete the task.
For Windows Vista, Windows 7, Windows Server 2008, Windows 8, Windows 8.1, and Windows Server 2012:
- Open the Windows Task Scheduler. To do this:
• On Windows Vista, Windows 7, and Windows Server 2008, click Start, type taskschd.msc in the Search input field, then press Enter.
• On Windows 8, Windows 8.1, and Windows Server 2012, right-click on the lower left corner of the screen, click Run, type taskschd.msc, then press Enter. - In the left panel, click Task Scheduler Library.
- In the upper-middle panel, locate each {Task Name} values listed above in the Name column.
- In the lower-middle panel, click the Actions tab. In the Details column, check for the {Task to be run} string.
- If the said string is found, delete the task.
Step 5
Search and delete this folder
- %Application Data%\Microsoft\Windows\{random folder name}
Step 6
Search and delete this file
- %Start Menu%\Programs\Startup\{random filename}.lnk
- %User Temp%\allradio_4.27_portable.exe
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_DLOADR.AUSUMS. 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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