Trojan.Win32.SHELLOAD.AA
Fareit-FRP!9A89C823F2A9(NAI); Trojan:Win32/FormBook.AD!MTB(MICROSOFT);
Windows
![](/vinfo/imgFiles/legend.jpg)
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.
It does not have any propagation routine.
It does not have any backdoor routine.
It does not have any information-stealing capability.
However, as of this writing, the said sites are inaccessible.
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:
- %User Profile%\subfolder1\filename1.exe
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name} on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
It adds the following processes:
- {execution file path}\{original filename}.exe
- RegAsm.exe → injected with malicious code
It creates the following folders:
- %User Profile%\subfolder1
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name} on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
It injects codes into the following process(es):
- RegAsm.exe → executed by the malware itself
Other System Modifications
This Trojan adds the following registry entries as part of its installation routine:
HKCU\Software\Microsoft\
Windows\CurrentVersion\RunOnce
Startup = "%User Profile%\subfolder1\filename1.exe"
Propagation
This Trojan does not have any propagation routine.
Backdoor Routine
This Trojan does not have any backdoor routine.
Rootkit Capabilities
This Trojan does not have rootkit capabilities.
Information Theft
This Trojan does not have any information-stealing capability.
Other Details
This Trojan does the following:
- It connects to the following URL to download and execute code in memory:
- https://drive.{BLOCKED}e.com/uc?export=download&id=1UCjHY1OzUC3otphBJHqkeTEetEVWM86W
However, as of this writing, the said sites are inaccessible.
It does not exploit any vulnerability.
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
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
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\RunOnce
- Startup = "%User Profile%\subfolder1\filename1.exe"
- Startup = "%User Profile%\subfolder1\filename1.exe"
Step 5
Search and delete these files
- %User Profile%\subfolder1\filename1.exe
Step 6
Search and delete these folders
- %User Profile%\subfolder1
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as Trojan.Win32.SHELLOAD.AA. 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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