BACKDOOR.WIN32.QUSARRAT.B
N/A
Windows
Threat Type: Backdoor
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Dropped by other malware, Downloaded from the Internet
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.
TECHNICAL DETAILS
321,552 bytes
Other
Yes
21 Dec 2018
Connects to URLs/IPs, Collects system information, Steals information, Modifies system registry
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 files:
- %System Root%\temp\CEgibifi.tmp
(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- MUTEX_6MGBmCAheeMzx6khOwZVu789
Backdoor Routine
This Backdoor executes the following commands from a remote malicious user:
- Update itself via Local file or URL
- Reconnect or Disconnect itself
- Remote Desktop
- Access on Network Devices connected
- Uninstall itself
- Remote Shell
- Search, Create, Modify, Rename and Delete Registry
- Download and upload a File
- Keylogger (Mouse and Keyboard)
- Modify and Delete (Path and Files)
- View TCP Connections
- Attempt to Elevate Client Permissions
- Shutdown/Restart/Sleep
- View Passwords
- Remote Execute a Local File or URL
- View System Information:
- Operating System
- Architecture: x86 (32-bit), or x64 (64-bit)
- Processor (CPU) Name
- Memory (RAM)
- Video Card (GPU) Name
- Username
- Computer Name
- Domain Name
- Host Name
- System Drive and Directory
- Device Up time
- MAC Address
- LAN IP Address
- WAN IP Address
- Antivirus Installed
- Firewall Installed
- Time zone
- Country
- ISP
- Reverse Proxy Feature
- Kill Process
- Start Process
- Install Plugin
It connects to the following URL(s) to send and receive commands from a remote malicious user:
- {BLOCKED}.{BLOCKED}.{BLOCKED}.179:443
Other Details
This Backdoor does the following:
- This backdoor was decrypted by TROJAN.WIN64.RAVEN.AC.
SOLUTION
9.850
14.728.02
03 Jan 2019
14.729.00
04 Jan 2019
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
Search and delete this file
- %System Root%\temp\CEgibifi.tmp
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BACKDOOR.WIN32.QUSARRAT.B. 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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