TROJ_MIUREF.BTSJM
Trojan:Win32/Miuref.C (Microsoft); Trojan.Miuref (Malwarebytes); Gen:Variant.Miuref.3 (BitDefender); TR/Miuref.A.22112 (Avira); W32/Muref.BR!tr (Fortinet); Trojan.Win32.Muref.ew (Kaspersky)
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
192,512 bytes
EXE, DLL
Yes
22 Dec 2016
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:
- %AppDataLocal%\{random folder name}\{malware filename}.exe
(Note: %AppDataLocal% is the Application Data folder found in Local Settings, where it is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local 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.)
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{GUID} = "{malware path and filename}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random folder name} = "%AppDataLocal%\{random folder name}\{malware filename}.exe"
Dropping Routine
This Trojan drops the following files:
- %AppDataLocal%\{random folder name}\{GUID}
- %AppDataLocal%\{random folder name}\{random file name}.txt
- %AppDataLocal%\{random folder name}\{random file name}.dat
- %AppDataLocal%\{random folder name}\{random file name}.idx
- %AppDataLocal%\{random folder name}\{random file name}.lck
(Note: %AppDataLocal% is the Application Data folder found in Local Settings, where it is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local 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.)
Other Details
This Trojan connects to the following possibly malicious URL:
- {BLOCKED}.{BLOCKED}unter.info
- {BLOCKED}.{BLOCKED}unter.info
- {BLOCKED}.{BLOCKED}unter.info
- {BLOCKED}.{BLOCKED}unter.info
- {BLOCKED}.{BLOCKED}unter.info
- {BLOCKED}e8.org
- {BLOCKED}rvice24.com
- http://{BLOCKED}.{BLOCKED}.67.195/{value}
- {BLOCKED}e8.org
SOLUTION
9.800
13.110.05
22 Dec 2016
13.111.00
23 Dec 2016
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
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\Run
- {GUID} = "{malware path and filename}"
- {GUID} = "{malware path and filename}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- {random folder name} = "%AppDataLocal%\{random folder name}\{malware filename}.exe"
- {random folder name} = "%AppDataLocal%\{random folder name}\{malware filename}.exe"
Step 5
Search and delete this folder
- %AppDataLocal%\{random folder name}
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_MIUREF.BTSJM. 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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