Windows
Analysis Report
muk.ps1
Overview
General Information
Detection
Remcos
Score: | 100 |
Range: | 0 - 100 |
Confidence: | 100% |
Signatures
Antivirus detection for URL or domain
Antivirus detection for dropped file
Contains functionality to bypass UAC (CMSTPLUA)
Detected Remcos RAT
Found malware configuration
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Sigma detected: Remcos
Suricata IDS alerts for network traffic
Yara detected Remcos RAT
Yara detected UAC Bypass using CMSTP
C2 URLs / IPs found in malware configuration
Contains functionality to register a low level keyboard hook
Contains functionality to steal Chrome passwords or cookies
Contains functionality to steal Firefox passwords or cookies
Contains functionalty to change the wallpaper
Found suspicious powershell code related to unpacking or dynamic code loading
Injects a PE file into a foreign processes
Joe Sandbox ML detected suspicious sample
PE file contains section with special chars
PE file has nameless sections
Powershell drops PE file
Allocates memory with a write watch (potentially for evading sandboxes)
Binary contains a suspicious time stamp
Contains functionality for read data from the clipboard
Contains functionality to call native functions
Contains functionality to check if a debugger is running (IsDebuggerPresent)
Contains functionality to download and launch executables
Contains functionality to dynamically determine API calls
Contains functionality to enumerate running services
Contains functionality to launch a control a shell (cmd.exe)
Contains functionality to modify clipboard data
Contains functionality to query CPU information (cpuid)
Contains functionality to query locales information (e.g. system language)
Contains functionality to read the PEB
Contains functionality to read the clipboard data
Contains functionality to retrieve information about pressed keystrokes
Contains functionality to shutdown / reboot the system
Contains functionality to simulate mouse events
Contains functionality which may be used to detect a debugger (GetProcessHeap)
Contains long sleeps (>= 3 min)
Creates a process in suspended mode (likely to inject code)
Detected TCP or UDP traffic on non-standard ports
Detected non-DNS traffic on DNS port
Detected potential crypto function
Downloads executable code via HTTP
Drops PE files
Enables debug privileges
Extensive use of GetProcAddress (often used to hide API calls)
Found a high number of Window / User specific system calls (may be a loop to detect user behavior)
Found evasive API chain checking for process token information
Found inlined nop instructions (likely shell or obfuscated code)
Found potential string decryption / allocating functions
HTTP GET or POST without a user agent
IP address seen in connection with other malware
Internet Provider seen in connection with other malware
May sleep (evasive loops) to hinder dynamic analysis
PE file contains sections with non-standard names
Queries the volume information (name, serial number etc) of a device
Sigma detected: Change PowerShell Policies to an Insecure Level
Suricata IDS alerts with low severity for network traffic
Uses Microsoft's Enhanced Cryptographic Provider
Uses code obfuscation techniques (call, push, ret)
Yara detected Keylogger Generic
Yara signature match
Classification
- System is w10x64
powershell.exe (PID: 7960 cmdline:
"C:\Window s\System32 \WindowsPo werShell\v 1.0\powers hell.exe" -noLogo -E xecutionPo licy unres tricted -f ile "C:\Us ers\user\D esktop\muk .ps1" MD5: C32CA4ACFCC635EC1EA6ED8A34DF5FAC) conhost.exe (PID: 7980 cmdline:
C:\Windows \system32\ conhost.ex e 0xffffff ff -ForceV 1 MD5: 0D698AF330FD17BEE3BF90011D49251D) JXCJKXCJHKJHXCJHKXCXCJHK.exe (PID: 7616 cmdline:
"C:\Users\ user\AppDa ta\Local\T emp\JXCJKX CJHKJHXCJH KXCXCJHK.e xe" MD5: 315CD40957F3E96C56AD91D296A1CE43) JXCJKXCJHKJHXCJHKXCXCJHK.exe (PID: 2304 cmdline:
"C:\Users\ user\AppDa ta\Local\T emp\JXCJKX CJHKJHXCJH KXCXCJHK.e xe" MD5: 315CD40957F3E96C56AD91D296A1CE43) JXCJKXCJHKJHXCJHKXCXCJHK.exe (PID: 3324 cmdline:
"C:\Users\ user\AppDa ta\Local\T emp\JXCJKX CJHKJHXCJH KXCXCJHK.e xe" MD5: 315CD40957F3E96C56AD91D296A1CE43)
notepad.exe (PID: 7268 cmdline:
"C:\Window s\System32 \notepad.e xe" "C:\Us ers\user\D esktop\muk .ps1" MD5: 27F71B12CB585541885A31BE22F61C83)
- cleanup
Name | Description | Attribution | Blogpost URLs | Link |
---|---|---|---|---|
Remcos, RemcosRAT | Remcos (acronym of Remote Control & Surveillance Software) is a commercial Remote Access Tool to remotely control computers.Remcos is advertised as legitimate software which can be used for surveillance and penetration testing purposes, but has been used in numerous hacking campaigns.Remcos, once installed, opens a backdoor on the computer, granting full access to the remote user.Remcos is developed by the cybersecurity company BreakingSecurity. |
{"Host:Port:Password": ["198.23.227.212:32583:1"], "Assigned name": "Yavakosa", "Connect interval": "1", "Install flag": "Disable", "Setup HKCU\\Run": "Enable", "Setup HKLM\\Run": "Disable", "Install path": "AppData", "Copy file": "yavascript.exe", "Startup value": "Disable", "Hide file": "Disable", "Mutex": "Rmc-DJTZHJ", "Keylog flag": "0", "Keylog path": "Application path", "Keylog file": "logs.dat", "Keylog crypt": "Disable", "Hide keylog file": "Disable", "Screenshot flag": "Disable", "Screenshot time": "1", "Take Screenshot option": "Disable", "Take screenshot title": "", "Take screenshot time": "5", "Screenshot path": "AppData", "Screenshot file": "Screenshots", "Screenshot crypt": "Disable", "Mouse option": "Disable", "Delete file": "Disable", "Audio record time": "5", "Audio folder": "MicRecords", "Connect delay": "0", "Copy folder": "xenor", "Keylog folder": "remcos"}
Source | Rule | Description | Author | Strings |
---|---|---|---|---|
JoeSecurity_Remcos | Yara detected Remcos RAT | Joe Security | ||
JoeSecurity_UACBypassusingCMSTP | Yara detected UAC Bypass using CMSTP | Joe Security | ||
Windows_Trojan_Remcos_b296e965 | unknown | unknown |
| |
REMCOS_RAT_variants | unknown | unknown |
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INDICATOR_SUSPICIOUS_EXE_UACBypass_CMSTPCOM | Detects Windows exceutables bypassing UAC using CMSTP COM interfaces. MITRE (T1218.003) | ditekSHen |
| |
Click to see the 7 entries |
Source | Rule | Description | Author | Strings |
---|---|---|---|---|
JoeSecurity_Remcos | Yara detected Remcos RAT | Joe Security | ||
JoeSecurity_UACBypassusingCMSTP | Yara detected UAC Bypass using CMSTP | Joe Security | ||
Windows_Trojan_Remcos_b296e965 | unknown | unknown |
| |
REMCOS_RAT_variants | unknown | unknown |
| |
INDICATOR_SUSPICIOUS_EXE_UACBypass_CMSTPCOM | Detects Windows exceutables bypassing UAC using CMSTP COM interfaces. MITRE (T1218.003) | ditekSHen |
| |
Click to see the 6 entries |
System Summary |
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Source: | Author: frack113: |
Source: | Author: Roberto Rodriguez @Cyb3rWard0g (rule), oscd.community (improvements): |
Stealing of Sensitive Information |
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Source: | Author: Joe Security: |
Timestamp | SID | Severity | Classtype | Source IP | Source Port | Destination IP | Destination Port | Protocol |
---|---|---|---|---|---|---|---|---|
2025-03-14T11:03:05.058670+0100 | 2036594 | 1 | Malware Command and Control Activity Detected | 192.168.2.4 | 49725 | 198.23.227.212 | 32583 | TCP |
Timestamp | SID | Severity | Classtype | Source IP | Source Port | Destination IP | Destination Port | Protocol |
---|---|---|---|---|---|---|---|---|
2025-03-14T11:03:03.220814+0100 | 2019714 | 2 | Potentially Bad Traffic | 192.168.2.4 | 49723 | 176.65.144.3 | 80 | TCP |
Timestamp | SID | Severity | Classtype | Source IP | Source Port | Destination IP | Destination Port | Protocol |
---|---|---|---|---|---|---|---|---|
2025-03-14T11:03:03.339783+0100 | 2001046 | 3 | Misc activity | 176.65.144.3 | 80 | 192.168.2.4 | 49723 | TCP |
Timestamp | SID | Severity | Classtype | Source IP | Source Port | Destination IP | Destination Port | Protocol |
---|---|---|---|---|---|---|---|---|
2025-03-14T11:03:06.678795+0100 | 2803304 | 3 | Unknown Traffic | 192.168.2.4 | 49726 | 178.237.33.50 | 80 | TCP |
Click to jump to signature section
Show All Signature Results
AV Detection |
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Source: | Avira URL Cloud: |
Source: | Avira: |
Source: | Malware Configuration Extractor: |
Source: | ReversingLabs: |
Source: | Virustotal: | Perma Link | ||
Source: | ReversingLabs: |
Source: | File source: | ||
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Source: | File source: | ||
Source: | File source: |
Source: | Integrated Neural Analysis Model: |
Source: | Code function: | 10_2_00433B64 |
Source: | Binary or memory string: |
Exploits |
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Source: | File source: | ||
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Privilege Escalation |
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Source: | Code function: | 10_2_00406ABC |
Source: | Binary string: | ||
Source: | Binary string: |
Source: | Code function: | 10_2_004090DC | |
Source: | Code function: | 10_2_0040B6B5 | |
Source: | Code function: | 10_2_0041C7E5 | |
Source: | Code function: | 10_2_0040B8BA | |
Source: | Code function: | 10_2_0044E989 | |
Source: | Code function: | 10_2_00408CDE | |
Source: | Code function: | 10_2_00419CEE | |
Source: | Code function: | 10_2_00407EDD | |
Source: | Code function: | 10_2_00406F13 |
Source: | Code function: | 10_2_00407357 |
Source: | File opened: | Jump to behavior | ||
Source: | File opened: | Jump to behavior | ||
Source: | File opened: | Jump to behavior | ||
Source: | File opened: | Jump to behavior | ||
Source: | File opened: | Jump to behavior | ||
Source: | File opened: | Jump to behavior |
Source: | Code function: | 5_2_02AE5188 |
Networking |
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Source: | Suricata IDS: |
Source: | IPs: |
Source: | TCP traffic: |
Source: | TCP traffic: |
Source: | HTTP traffic detected: |