Backdoor.Win64.WINNTI.ZCKK-B
Win32:Winnti-AF (AVAST)
Windows
Threat Type: Backdoor
Destructiveness: No
Encrypted:
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 listens on ports. It executes commands from a remote malicious user, effectively compromising the affected system.
TECHNICAL DETAILS
151,040 bytes
DLL
No
07 Nov 2023
Collects system information, 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.
Backdoor Routine
This Backdoor listens on the following ports:
- 42385
It executes the following commands from a remote malicious user:
- Executes arbitrary commands
Information Theft
This Backdoor gathers the following data:
- User and System Default Language ID
- Timezone Information
- Username
- Computer Name
- Remote Desktop Host session
- Get OS Version
- System's Locale
Other Details
This Backdoor does the following:
- It requires being registered as a service to properly execute.
- It decrypts and executes the following file in memory which contains the backdoor routine:
- Bkavvupdata.dat → detected as Backdoor.Win64.WINNTI.ZCKK-B.enc
- It may use the following to resolve the C2 domain:
- {BLOCKED}.{BLOCKED}.{BLOCKED}.222
SOLUTION
9.800
18.822.05
16 Nov 2023
18.823.00
17 Nov 2023
Step 1
Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 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
Scan your computer with your Trend Micro product to delete files detected as Backdoor.Win64.WINNTI.ZCKK-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 the following Trend Micro Support pages for more information:
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