BKDR_PROXY.MG
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: Backdoor
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
This backdoor 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.
TECHNICAL DETAILS
274,944 bytes
DLL
Yes
03 Sep 2014
Connects to URLs/IPs, Compromises system security
Arrival Details
This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Propagation
This backdoor does not have any propagation routine.
Backdoor Routine
This backdoor executes the following commands from a remote malicious user:
- Create processes with user's privilege
- Create, copy or delete folders and or files
- Find, read and get file information
- Get drive information
- Download and execute arbitrary files
- Perform remote shell commands
It connects to the following URL(s) to send and receive commands from a remote malicious user:
- www.{BLOCKED}x.co.jp/{random 5-digit number}.html
Information Theft
This backdoor gathers the following data:
- computer name
NOTES:
It may be registered as a service by other malware to ensure its automatic execution at every system startup by adding the following registry keys:
- HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\upsl
It has the following file information to trick users that it is a legitimate file:
File Version: 6.1.7600.16385
Description: Machine Debug Manager
Copyright: © Microsoft Corporation. All rights reserved.
Company: Microsoft Corporation
File Version: 6.00.8149
Internal Name: mdm.dll
Language: English (United States)
Original File name: mdm.dll
Product Name: Microsoft Windows Operating System
Product Version: 6.00.8149
It connects to the following non-malicious sites to trick users that it is a legitimate file:
- www.microsoft.com
- www.msftncsi.com
- www.yahoo.co.jp
It finds a user of the computer that employs a proxy by reading proxy-related registry entries. If it finds one, it employs the user's proxy server settings to connect to its C&C server.
It does not have rootkit capabilities.
It does not exploit any vulnerability.
SOLUTION
9.700
11.130.03
05 Sep 2014
11.131.00
06 Sep 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
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. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
- upsl
- upsl
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_PROXY.MG. 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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