BKDR_STASER.C
Trojan.Win32.Staser (Ikarus)
Windows
Threat Type: Backdoor
Destructiveness: No
Encrypted: No
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 executes commands from a remote malicious user, effectively compromising the affected system.
It gathers certain information on the affected computer.
It connects to certain websites to send and receive information.
TECHNICAL DETAILS
15,360 bytes
EXE
Yes
05 May 2015
Compromises system security, Connects to URLs/IPs
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:
- %System%\Infov.exe
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
Autostart Technique
This backdoor registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Infov
DisplayName = Infov
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Infov
ImagePath = %System%\Infov.exe
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Infov
Start = 2
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Infov
Type = 110
Other System Modifications
This backdoor adds the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Infov
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Enum\Root\LEGACY_INFOV
Backdoor Routine
This backdoor executes the following commands from a remote malicious user:
- Download possibly additional malicious files
- Run/Execute application/process
- Terminate application/process
Information Theft
This backdoor gathers the following information on the affected computer:
- IP address and hostname
- Logical drives (A: to Z:) types and free space
- Root folder contents (files and folders)
- Check and list running processes and their respective path and filename
Other Details
This backdoor connects to the following website to send and receive information:
- www.{BLOCKED}469.com
SOLUTION
9.750
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.
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services
- Infov
- Infov
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\Root
- LEGACY_INFOV
- LEGACY_INFOV
Step 5
Search and delete these files
- %System%\Infov.exe
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_STASER.C. 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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