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Windows
Analysis Report
Salary Increase Letter_Oct 2024.vbs
Overview
General Information
| Sample name: | Salary Increase Letter_Oct 2024.vbs |
| Analysis ID: | 1533043 |
| MD5: | 487fcfcc1cb2d0a2f46618ee515bd75f |
| SHA1: | 946401dfded730d640409b73842063ec9d341367 |
| SHA256: | 46e052d1dcd2455c656a4f96ce8a6ab32d0c3b4cdc151094df100b0c14b1ba64 |
| Tags: | vbsuser-abuse_ch |
| Infos: |   |
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Detection
Remcos, GuLoader
| Score: | 100 |
| Range: | 0 - 100 |
| Whitelisted: | false |
| Confidence: | 100% |
Signatures
Detected Remcos RAT
Early bird code injection technique detected
Found malware configuration
Sigma detected: Remcos
Suricata IDS alerts for network traffic
VBScript performs obfuscated calls to suspicious functions
Yara detected GuLoader
Yara detected Powershell download and execute
Yara detected Remcos RAT
AI detected suspicious sample
C2 URLs / IPs found in malware configuration
Found suspicious powershell code related to unpacking or dynamic code loading
Potential malicious VBS script found (suspicious strings)
Queries sensitive service information (via WMI, WIN32_SERVICE, often done to detect sandboxes)
Queues an APC in another process (thread injection)
Sigma detected: WScript or CScript Dropper
Suspicious execution chain found
Suspicious powershell command line found
Writes to foreign memory regions
Wscript starts Powershell (via cmd or directly)
Checks if the current process is being debugged
Contains functionality to access loader functionality (e.g. LdrGetProcedureAddress)
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 potential crypto function
Found WSH timer for Javascript or VBS script (likely evasive script)
Found a high number of Window / User specific system calls (may be a loop to detect user behavior)
HTTP GET or POST without a user agent
IP address seen in connection with other malware
Internet Provider seen in connection with other malware
Java / VBScript file with very long strings (likely obfuscated code)
May sleep (evasive loops) to hinder dynamic analysis
Queries the volume information (name, serial number etc) of a device
Sample execution stops while process was sleeping (likely an evasion)
Sigma detected: Msiexec Initiated Connection
Sigma detected: WSF/JSE/JS/VBA/VBE File Execution Via Cscript/Wscript
Suricata IDS alerts with low severity for network traffic
Too many similar processes found
Uses a known web browser user agent for HTTP communication
Uses code obfuscation techniques (call, push, ret)
Very long cmdline option found, this is very uncommon (may be encrypted or packed)
Very long command line found
Classification
| 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. |
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| Name | Description | Attribution | Blogpost URLs | Link |
|---|---|---|---|---|
| CloudEyE, GuLoader | CloudEyE (initially named GuLoader) is a small VB5/6 downloader. It typically downloads RATs/Stealers, such as Agent Tesla, Arkei/Vidar, Formbook, Lokibot, Netwire and Remcos, often but not always from Google Drive. The downloaded payload is xored. | No Attribution |
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AV Detection |
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E-Banking Fraud |
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System Summary |
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