TrojanSpy.JS.REDLINE.PRL
GT:JS.Backdoor.5.94FA5AA4 (BITDEFENDER)
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.
It does not have any propagation routine.
It executes commands from a remote malicious user, effectively compromising the affected system. However, as of this writing, the said sites are inaccessible.
TECHNICAL DETAILS
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 drops and executes the following files:
- %Application Data%\OFsUEelmcAJ\NvPlhiGXOZzAHBpMRIwDoXGRmmFGvq.js → dropped copy
(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).)
Autostart Technique
This Trojan Spy adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
OFsUEelmcAJ = "%Windows%\System32\wscript.exe" "{malware path}" hiGXOZzA
Propagation
This Trojan Spy does not have any propagation routine.
Backdoor Routine
This Trojan Spy executes the following commands from a remote malicious user:
- -7 → Updates the malware script and execute
- -6 → Uninstall itself from the system
- -5 → Exit the script
- -4 → Restart and set connected status
- -3 → Set disconnected status
- -2 → Set connected status
- -1 → Sleep
- 1 → Download file and execute from C2 then reset ping and connection state
- 2 → Execute command from C2 then reset ping and connection state
It connects to the following URL(s) to send and receive commands from a remote malicious user:
- http://{BLOCKED}.{BLOCKED}.{BLOCKED}.56:5219/WzbtsL
However, as of this writing, the said sites are inaccessible.
Rootkit Capabilities
This Trojan Spy does not have rootkit capabilities.
Download Routine
This Trojan Spy saves the files it downloads using the following names:
- %User Temp%\{random}
(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(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
Information Theft
This Trojan Spy gathers the following data:
- Computer Serial Number
- Total RAM
- OS Information
- User Domain
- Username
- Process List
Other Details
This Trojan Spy does the following:
- It opens a decoy pdf in from the following URL:
- https://{BLOCKED}omd.org/uploads/2018/05/blank.pdf
It accepts the following parameters:
- Accepts the following parameters:
- hiGXOZzA → immediately start connection to the C2 server
- RIwDoXGR → wait and then connect to c2 server
- --update → copy and execute malware update from c2 server then delete old copy
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 these registry values
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator’s help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- OFsUEelmcAJ = "%Windows%\System32\wscript.exe" {malware path} hiGXOZzA
- OFsUEelmcAJ = "%Windows%\System32\wscript.exe" {malware path} hiGXOZzA
Step 5
Search and delete these files
- %Application Data%\OFsUEelmcAJ\NvPlhiGXOZzAHBpMRIwDoXGRmmFGvq.js
- %User Temp%\{random}
Step 6
Search and delete these folders
- %Application Data%\OFsUEelmcAJ
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TrojanSpy.JS.REDLINE.PRL. 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.
Step 8
Scan your computer with your Trend Micro product to delete files detected as TrojanSpy.JS.REDLINE.PRL. 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:
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