TrojanSpy.Win32.NANOCORE.AL
Windows
Threat Type: Trojan Spy
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan Spy 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
1,332,736 bytes
EXE
Yes
19 Feb 2020
Arrival Details
This Trojan Spy 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 Spy creates the following folders:
- %Program Files%\DSL Subsystem
- %Application Data%\0EFADD19-2A94-41FB-8931-F2BBC5D61333
- %Application Data%\0EFADD19-2A94-41FB-8931-F2BBC5D61333\Logs\{username}
- %Application Data%\0EFADD19-2A94-41FB-8931-F2BBC5D61333\Logs
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 2008(64-bit), 2012(64-bit) and 10(64-bit).. %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 System Modifications
This Trojan Spy deletes the following files:
- %Application Data%\0EFADD19-2A94-41FB-8931-F2BBC5D61333\DSL Subsystem\dslss.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(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 adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Run
DSL Subsystem = "%Program Files%\DSL Subsystem\dslss.exe"
Dropping Routine
This Trojan Spy drops the following files:
- %Program Files%\DSL Subsystem\dslss.exe
- %Application Data%\0EFADD19-2A94-41FB-8931-F2BBC5D61333\run.dat
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 2008(64-bit), 2012(64-bit) and 10(64-bit).. %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 Spy connects to the following possibly malicious URL:
- http://paul456.{BLOCKED}s.net
This report is generated via an automated analysis system.
SOLUTION
9.850
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
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_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run
- DSL Subsystem = "%Program Files%\DSL Subsystem\dslss.exe"
Step 3
Search and delete these components
- %Program Files%\DSL Subsystem\dslss.exe
- %Application Data%\0EFADD19-2A94-41FB-8931-F2BBC5D61333\run.dat
Step 4
Search and delete these folders
- %Program Files%\DSL Subsystem
- %Application Data%\0EFADD19-2A94-41FB-8931-F2BBC5D61333
- %Application Data%\0EFADD19-2A94-41FB-8931-F2BBC5D61333\Logs\{username}
- %Application Data%\0EFADD19-2A94-41FB-8931-F2BBC5D61333\Logs
Step 5
Scan your computer with your Trend Micro product to delete files detected as TrojanSpy.Win32.NANOCORE.AL. 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 the following Trend Micro Support pages for more information:
Step 6
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.
- %Application Data%\0EFADD19-2A94-41FB-8931-F2BBC5D61333\DSL Subsystem\dslss.exe
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