TROJ_MIUREF.A
Troj/VBDrop-AS (Sophos) ,Trojan horse Generic35.AXFQ (AVG) ,W32/Dorkbot.BAAr (Fortinet) ,Trojan.Win32.Inject (Ikarus) ,Trojan.Win32.Inject.gyju (Kaspersky) ,Trojan.Dropper (Symantec) ,Trojan.Win32.GenericT (Sunbelt)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
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.
It connects to certain websites to send and receive information. It creates an event.
TECHNICAL DETAILS
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 files:
- %User Temp%\setup.dat
- %User Temp%\data.dat
- %Application Data%\Mozilla\Firefox\Profiles\4wwmjcqo.default\extensions.sqlite
- %Application Data%\Mozilla\Firefox\Profiles\4wwmjcqo.default\extensions\{A9E3A5E6-A75E-B689-2181-696FC74540D3\chrome.manifest
- %Application Data%\Mozilla\Firefox\Profiles\4wwmjcqo.default\extensions\{A9E3A5E6-A75E-B689-2181-696FC74540D3\install.rdf
- %Application Data%\Mozilla\Firefox\Profiles\4wwmjcqo.default\extensions.sqlite\{A9E3A5E6-A75E-B689-2181-696FC74540D3\components\RMGetLicenseClass.js - detected as JS_MIUREF.A
(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 and 7.. %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.)
It drops and executes the following files:
- %User Temp%\qpsbalkr.exe - also detected as TROJ_MIUREF.A
(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 and 7.)
It adds the following processes:
- iexplore.exe
It creates the following folders:
- %Application Data%\Mozilla\Firefox\Profiles\4wwmjcqo.default\extensions\{A9E3A5E6-A75E-B689-2181-696FC74540D3
- %Application Data%\Mozilla\Firefox\Profiles\4wwmjcqo.default\extensions\{A9E3A5E6-A75E-B689-2181-696FC74540D3\components
(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\RunOnce
{GUID} = "%User Temp%\qpsbalkr.exe"
Information Theft
This Trojan gathers the following data:
- Computer Name / Username
- OS Version
- Browser Informations
Other Details
Based on analysis of the codes, it has the following capabilities:
- Install Browser plugins (it may do this monitor browser activites, display popup ads or execute arbitrary scripts)
It connects to the following website to send and receive information:
- http://{BLOCKED}.{BLOCKED}.80.139/{value}
- http://{BLOCKED}.{BLOCKED}.212.49/{value}
It creates the following event(s):
- {Computer Name}{Fullpath and Filename} special characters replaced with '_'
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
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\RunOnce
- {GUID} = "%User Temp%\qpsbalkr.exe"
- {GUID} = "%User Temp%\qpsbalkr.exe"
Step 4
Search and delete these folders
- %Application Data%\Mozilla\Firefox\Profiles\4wwmjcqo.default\extensions\{A9E3A5E6-A75E-B689-2181-696FC74540D3
Step 5
Search and delete this file
- %User Temp%\setup.dat
- %User Temp%\data.dat
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_MIUREF.A. 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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