BKDR_NBOT.A
VirTool:Win32/CeeInject.gen!KK (Microsoft), Trojan.Win32.Tinba.go (Kaspersky)
Windows
Threat Type: Backdoor
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
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 executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information.
It terminates itself if it detects it is being run in a virtual environment.
TECHNICAL DETAILS
356,434 bytes
EXE
Yes
05 Nov 2014
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 drops the following copies of itself into the affected system:
- {Root Drive}:\myapp.exe
It injects codes into the following process(es):
- %Program Files%\iexplore.exe
(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)
Backdoor Routine
This backdoor executes the following commands from a remote malicious user:
- download arbitrary files
- download and immediately execute updated copy
- download and execute updated copy after reboot
- start SOCKS proxy server
- stop SOCKS proxy server
- reboot the system
- steal cookies
- delete cookies from browsers
- uninstall itself
- download configuration file
- inject codes to site to monitor sites
- capture screenshots
It connects to the following websites to send and receive information:
- http://{BLOCKED}7.{BLOCKED}8.90.193/nbotlogs/debug.php?
It sends information in the following format: ver={version}&uid={UID}&process={process name}&pid={process ID}&level={value}&error={value}&status={value}&time={value}&message={value}&counter={value}&left={value}&data={stolen data}
Information Theft
This backdoor gathers the following data:
- OS version
- number of processors
- computer name
- username
- current time
- windows directory
- system directory
- program files directory
- application data directory
- screenshots
Other Details
This backdoor terminates itself if it detects it is being run in a virtual environment.
NOTES:
It monitors the following browsers:
- Firefox
- Chrome
- Internet Explorer
Its configuration file may contain the sites and processes that it will monitor. It may perform any of the following once configuration file is received:
- Script injections on specific websites
- Monitor specific processes
- Capture screenshots upon accessing specific sites
SOLUTION
9.700
11.258.07
05 Nov 2014
11.259.00
05 Nov 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 normal mode and scan your computer with your Trend Micro product for files detected as BKDR_NBOT.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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