TSPY_BEBLOH.YMNON
Trojan.Win32.Yakes.wxoh (Kaspersky), Trojan:Win32/Tiggre!rfn (Microsoft)
Windows
Threat Type: Trojan Spy
Destructiveness: No
Encrypted: Yes
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 connects to certain websites to send and receive information.
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 the following files:
- %Application Data%\{random string}.lnk -> executes %Program Files%\Windows NT\{random filename}.exe
- (Note: Creation of this file is triggered when the affected system is shutting down, appends parameter "-autorun" to executed copy)
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), 7 (32-bit), and 8 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), 7 (64-bit), and 8 (64-bit).)
It drops the following copies of itself into the affected system:
- %Program Files%\Windows NT\{random filename}.exe
- (Note: Creation of this copy is triggered when the affected system is shutting down)
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), 7 (32-bit), and 8 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), 7 (64-bit), and 8 (64-bit).)
It adds the following processes:
- explorer.exe
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- Global\ Uz{Random Hex}
It injects codes into the following process(es):
- The created "explorer.exe" by this malware
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
{random string} = "%Application Data%\{random string}.lnk"
- (Note: Creation of this registry entry is triggered when the affected system is shutting down)
Other System Modifications
This Trojan Spy adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\{Random Key}
It adds the following registry entries:
HKEY_CURRENT_USER\Software\{random key}
(Default) = {Hex Values}
Download Routine
This Trojan Spy saves the files it downloads using the following names:
- %User Temp%\{random filename}.exe
(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, and 8.)
Information Theft
This Trojan Spy gathers the following data:
- Machine Name
- OS Information (Version, Product ID, Name, Install Date)
- Explorer File Information
- Volume Serial Number
- Network Configuration (IP address, Socket, Ports)
- Keyboard Layout
- CPU Information
- Video BIOS Version
Stolen Information
This Trojan Spy sends the gathered information via HTTP POST to the following URL:
- https://{BLOCKED}ola.com/auth/?tver={value}&vcmd={value}&cc={value}&hh={hex values}&ipcnf={IP address}+&sckport={value}&pros={value}&keret={value};&email={value}
Other Details
This Trojan Spy connects to the following URL(s) to check for an Internet connection:
- www.google.com
It connects to the following website to send and receive information:
- https://{BLOCKED}ola.com/auth/
- {Random Generated Domain}.com
- {Random Generated Domain}.net
It does the following:
- Updates Itself.
- Does not execute its malicious routine if it detects it runs on a simulated environment:
- Running on a VMWare or VirtualBox Environment
- Process has a sbiedl.dll module
- Processor name contains the string "Xeon"
- File path contains the following strings:
- \SAMPLE
- VIRUS
- SANDBOX
- Deletes cache files for Google Chrome and Mozilla Firefox.
- This malware does any of the following based on the reply of its C&C server:
- Sleep and wait for the next reply
- Receive download URL to download other possibly malicious files
- The file names used for its dropped copy may contain the following strings combined with random characters:
- def
- dns
- exec
- hlp
- logon
- mem
- mixer
- mon
- pack
- play
- setup
- srv
- user
- video
- win
- It may also use a purely random set of characters as filename for its dropped copy.
SOLUTION
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 key
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\{random key}
- (Default) = {Hex Values}
- (Default) = {Hex Values}
Step 5
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
- {random string} = "%Application Data%\{random string}.lnk"
- {random string} = "%Application Data%\{random string}.lnk"
Step 6
Search and delete this file
- %User Temp%\{random filename}.exe
- %Application Data%\{random string}.lnk
- %Program Files%\Windows NT\{random filename}.exe
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_BEBLOH.YMNON. 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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