BKDR_EMDIVI.AE
Trojan:Win32/Xabil.A (Microsoft)
Windows
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 runs certain commands that it receives remotely from a malicious user. Doing this puts the affected computer and information found on the computer at greater risk.
It retrieves specific information from the affected system.
TECHNICAL DETAILS
267,776 bytes
EXE
Yes
07 May 2015
Connects to URLs/IPs, Compromises system security, Steals information
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.
Installation
This backdoor adds the following mutexes to ensure that only one of its copies runs at any one time:
- f9d0d9bfba7e4e06b4b75ab0200fe602
Autostart Technique
This backdoor modifies the following registry entries to ensure it automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Userinit = "%System%\userinit.exe,{malware file path}\{malware file name}.exe,"
(Note: The default value data of the said registry entry is "%System%\userinit.exe,".)
Backdoor Routine
This backdoor executes the following command(s) from a remote malicious user:
- Enumerate files and folders
- Delete files and folders
- Download files
- Upload files
- Execute files
- Get file attributes
- Enumerate processes
- Perform remote shell
- Loads a library using LoadLibrary API
- Import functions from a library using GetProcAddress API
- Gather credentials using CredEnumerate or PStoreCreateInstance API
- Gather Firefox settings from prefs.js
- Gather proxy settings from proxy.pac
- Gather proxy settings from windows registry
- Sleep
It connects to the following URL(s) to send and receive commands from a remote malicious user:
- http://{BLOCKED}r.com/app/plugins/index.php
Information Theft
This backdoor retrieves the following information from the affected system:
- Host name
- Process ID of the malware
- Internet Explorer Version
- OS information (major version, minor version, and build number)
- System language
- Country/region
- Time zone information
Other Details
This backdoor connects to the following URL(s) to check for an Internet connection:
- http://www.microsoft.com
- http://www.msftncsi.com
- http://www.yahoo.co.jp
NOTES:
This backdoor enumerates all visible windows and compares each window's title bar text with the following strings:
- ollydbg
- W32Dasm
- Wireshark
- SoftICE
- Process Explorer
- Process Monitor
- Process Hacker
If a window's title bar text contains any of the said strings, it pauses the execution of its malicious routine by performing a Sleep command.
It does not execute properly if the hostname is similar to the following strings:
- wilbert-SC1508
- xp-sp3-template
- mip-xp-cht
- CWS01_03
- wilbert-SC2202
- CWS05D102
It does not have rootkit capabilities.
It does not exploit any vulnerability.
SOLUTION
9.750
11.656.06
08 May 2015
11.657.00
09 May 2015
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
Restore this modified 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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- From: Userinit = "%System%\userinit.exe,{malware file path}\{malware file name},"
To: Userinit = "%System%\userinit.exe,"
- From: Userinit = "%System%\userinit.exe,{malware file path}\{malware file name},"
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_EMDIVI.AE. 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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