TROJ_TIBRUN.SM
Trojan:Win32/Tibrun.B (Microsoft), Trojan.Asprox.B (Symantec)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
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.
It connects to certain websites to send and receive information.
TECHNICAL DETAILS
Varies
EXE
Yes
16 Jun 2014
Connects to URLs/IPs, Compromises system security
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 and executes them:
- %Application Data%\{malware filename}.exe
- {malware filename} can be any of the following:
- lcasc
- llasc
- {malware filename} can be any of the following:
(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming 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
Run_ = "%Application Data%\{malware filename}.exe"
Other Details
This Trojan connects to the following website to send and receive information:
- {BLOCKED}.{BLOCKED}.16.195/brut.loc/www/cmd.php
- {BLOCKED}.{BLOCKED}.99.157/brut.loc/www/cmd.php
It drops the following file(s)/component(s):
- %Application Data%\1.bat - deletes the initial malware 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, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
NOTES:
It connects to the URL to report status and to receive data.
It is capable of brute forcing Windows logon users via a list of passwords from the received data.
SOLUTION
9.700
10.867.00
16 Jun 2014
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
Restart in Safe Mode
Step 3
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
- Run_ = "%Application Data%\lsacs.exe"
- Run_ = "%Application Data%\lsacs.exe"
Step 4
Search and delete these files
- %Application Data%\1.bat
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_TIBRUN.SM. 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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