Proxyware.MSIL.PoshC2.A
VirTool:MSIL/PoshC2.A!MTB (MICROSOFT)
Windows
Threat Type: Proxyware
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Dropped by other malware
This Proxyware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
As of this writing, the said sites are inaccessible.
TECHNICAL DETAILS
18,944 bytes
EXE
No
14 Mar 2023
Connects to URLs/IPs, Collects system information, Steals information
Arrival Details
This Proxyware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Download Routine
This Proxyware connects to the following URL(s) to download its component file(s):
- https://b{BLOCKED}ecim.store/babel-polyfill/6.3.14/polyfill.min.js=/?checks
As of this writing, the said sites are inaccessible.
Information Theft
This Proxyware gathers the following data:
- Computer name
- User name
- Processor architecture
- Current process name and id
- System date and time
Other Details
This Proxyware does the following:
- Based on analysis of the codes, this malware has the following capabilities:
- It checks if the system date is less than 12-01-2999 (MM-DD-YYYY) before proceeding to its intended routine.
- If no network connection has been established,
It resets itself 30 times, with each reset occurring at longer intervals of minutes than the previous one. - It decrypts the following using a hard coded base-64 key
- Downloaded component file
- Received encrypted commands
- It matches the decrypted component with the following strings:
- RANDOMURI
- URLS
- KILLDATE
- SLEEP
- JITTER
- NEWKEY
- IMGS
- It compares the decrypted commands with the followings strings:
- multicmd
- exit
- loadmodule
- run-dll-background
- run-exe-background
- run-dll
- run-exe
- beacon
SOLUTION
9.800
2.607.00
16 Mar 2023
Step 1
Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:
- TROJ.Win32.TRX.XXPE50FFF066
Step 2
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 3
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 4
Identify and terminate files detected as Proxyware.MSIL.PoshC2.A
- Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
- If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
Step 5
Scan your computer with your Trend Micro product to delete files detected as Proxyware.MSIL.PoshC2.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 the following Trend Micro Support pages for more information:
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