JAVA_QRAT.AUSWV
Trojan:Java/QRat (Microsoft)
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
However, as of this writing, the said sites are inaccessible.
TECHNICAL DETAILS
527,822 bytes
JAR
Yes
14 Mar 2017
Arrival Details
This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
Installation
This Trojan adds the following folders:
- %User Profile%\muTRJLOWzHy
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
It drops the following copies of itself into the affected system:
- %User Temp%\OPIUYTUYDGCJVHJBJLK270292836425235605.JAR
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp 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.)
It drops the following file(s)/component(s):
- %User Temp%\m{Random Number}.tmp
- %User Temp%\_{Random Number}.class
- %User Temp%\Retrive{Random Number}.vbs
- %User Profile%\muTRJLOWzHy\xykavqTsiUW.TxkgPG
- %User Profile%\muTRJLOWzHy\ID.txt
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp 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.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
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
cHookStUYSs = "%Application Data%\Oracle\bin\javaw.exe" -jar "%User Profile%\muTRJLOWzHy\xykavqTsiUW.TxkgPG"
Other Details
This Trojan connects to the following possibly malicious URL:
- {BLOCKED}.{BLOCKED}.65.32:2180
However, as of this writing, the said sites are inaccessible.
SOLUTION
9.850
13.276.03
14 Mar 2017
13.277.00
15 Mar 2017
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
- cHookStUYSs = "%Application Data%\Oracle\bin\javaw.exe" -jar "%User Profile%\muTRJLOWzHy\xykavqTsiUW.TxkgPG"
- cHookStUYSs = "%Application Data%\Oracle\bin\javaw.exe" -jar "%User Profile%\muTRJLOWzHy\xykavqTsiUW.TxkgPG"
Step 5
Search and delete this folder
- %User Temp%\m{Random Number}.tmp
- %User Temp%\_{Random Number}.class
- %User Temp%\Retrive{Random Number}.vbs
- %User Profile%\muTRJLOWzHy\xykavqTsiUW.TxkgPG
- %User Profile%\muTRJLOWzHy\ID.txt
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as JAVA_QRAT.AUSWV. 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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