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Windows
Analysis Report
gYjK72gL17.exe
Overview
General Information
| Sample name: | gYjK72gL17.exerenamed because original name is a hash value |
| Original sample name: | 05dc698e49fce4efae5872eb54f19767.exe |
| Analysis ID: | 1580418 |
| MD5: | 05dc698e49fce4efae5872eb54f19767 |
| SHA1: | 29cfcfbbb21aefabe7c57a057dcf0335cb4a0ac0 |
| SHA256: | 86a95ebe542d3aed78191cf9bb40d86b7986b338e50941bf7db1ed5008a4e027 |
| Tags: | exeStealcuser-abuse_ch |
| Infos: |   |
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Detection
Stealc, Vidar
| Score: | 100 |
| Range: | 0 - 100 |
| Whitelisted: | false |
| Confidence: | 100% |
Signatures
Antivirus / Scanner detection for submitted sample
Antivirus detection for URL or domain
Attempt to bypass Chrome Application-Bound Encryption
Found malware configuration
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for submitted file
Suricata IDS alerts for network traffic
Yara detected Powershell download and execute
Yara detected Stealc
Yara detected Vidar stealer
AI detected suspicious sample
C2 URLs / IPs found in malware configuration
Found many strings related to Crypto-Wallets (likely being stolen)
Monitors registry run keys for changes
Overwrites code with unconditional jumps - possibly settings hooks in foreign process
Switches to a custom stack to bypass stack traces
Tries to harvest and steal Bitcoin Wallet information
Tries to harvest and steal browser information (history, passwords, etc)
Tries to harvest and steal ftp login credentials
Tries to steal Crypto Currency Wallets
Tries to steal Mail credentials (via file / registry access)
Contains functionality to call native functions
Contains functionality to check if a debugger is running (IsDebuggerPresent)
Contains functionality to dynamically determine API calls
Contains functionality to query CPU information (cpuid)
Detected potential crypto function
Downloads executable code via HTTP
Drops PE files
Drops PE files to the application program directory (C:\ProgramData)
Entry point lies outside standard sections
Extensive use of GetProcAddress (often used to hide API calls)
Found dropped PE file which has not been started or loaded
Found large amount of non-executed APIs
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
JA3 SSL client fingerprint seen in connection with other malware
PE / OLE file has an invalid certificate
PE file contains sections with non-standard names
Queries information about the installed CPU (vendor, model number etc)
Queries the volume information (name, serial number etc) of a device
Sample file is different than original file name gathered from version info
Sigma detected: Browser Started with Remote Debugging
Suricata IDS alerts with low severity for network traffic
Uses 32bit PE files
Uses Microsoft's Enhanced Cryptographic Provider
Uses code obfuscation techniques (call, push, ret)
Yara detected Credential Stealer
Yara signature match
Classification
| Name | Description | Attribution | Blogpost URLs | Link |
|---|---|---|---|---|
| Stealc | Stealc is an information stealer advertised by its presumed developer Plymouth on Russian-speaking underground forums and sold as a Malware-as-a-Service since January 9, 2023. According to Plymouth's statement, stealc is a non-resident stealer with flexible data collection settings and its development is relied on other prominent stealers: Vidar, Raccoon, Mars and Redline.Stealc is written in C and uses WinAPI functions. It mainly targets date from web browsers, extensions and Desktop application of cryptocurrency wallets, and from other applications (messengers, email clients, etc.). The malware downloads 7 legitimate third-party DLLs to collect sensitive data from web browsers, including sqlite3.dll, nss3.dll, vcruntime140.dll, mozglue.dll, freebl3.dll, softokn3.dll and msvcp140.dll. It then exfiltrates the collected information file by file to its C2 server using HTTP POST requests. | No Attribution |
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| Name | Description | Attribution | Blogpost URLs | Link |
|---|---|---|---|---|
| Vidar | Vidar is a forked malware based on Arkei. It seems this stealer is one of the first that is grabbing information on 2FA Software and Tor Browser. | No Attribution |
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AV Detection |
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