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Windows
Analysis Report
21Installer.exe
Overview
General Information
| Sample name: | 21Installer.exe |
| Analysis ID: | 1561443 |
| MD5: | 1c67f96a74b81a3e5008b2980822497d |
| SHA1: | a3aa8149d3bd2fe3f02c9aa24776cc9aa4440d2f |
| SHA256: | fe4a641b424d5b9a394f5da71f1043d13c46a5cbbf03f6f9f13b28a56685c5bd |
| Tags: | exeuser-aachum |
| Infos: |   |
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Detection
Stealc, Vidar
| Score: | 100 |
| Range: | 0 - 100 |
| Whitelisted: | false |
| Confidence: | 100% |
Signatures
Attempt to bypass Chrome Application-Bound Encryption
Found malware configuration
Suricata IDS alerts for network traffic
Yara detected AntiVM3
Yara detected Powershell download and execute
Yara detected Stealc
Yara detected Vidar
Yara detected Vidar stealer
AI detected suspicious sample
Allocates memory in foreign processes
C2 URLs / IPs found in malware configuration
Contains functionality to inject code into remote processes
Found many strings related to Crypto-Wallets (likely being stolen)
Injects a PE file into a foreign processes
Monitors registry run keys for changes
Searches for specific processes (likely to inject)
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Tries to harvest and steal Bitcoin Wallet information
Tries to harvest and steal Putty / WinSCP information (sessions, passwords, etc)
Tries to harvest and steal browser information (history, passwords, etc)
Tries to harvest and steal ftp login credentials
Tries to steal Crypto Currency Wallets
Writes to foreign memory regions
AV process strings found (often used to terminate AV products)
Abnormal high CPU Usage
Checks if Antivirus/Antispyware/Firewall program is installed (via WMI)
Contains functionality to call native functions
Contains functionality to check if a debugger is running (IsDebuggerPresent)
Contains functionality to detect sandboxes (mouse cursor move detection)
Contains functionality to dynamically determine API calls
Contains functionality to open a port and listen for incoming connection (possibly a backdoor)
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 record screenshots
Contains functionality which may be used to detect a debugger (GetProcessHeap)
Creates a process in suspended mode (likely to inject code)
Detected potential crypto function
Drops PE files
Drops PE files to the application program directory (C:\ProgramData)
Enables debug privileges
Extensive use of GetProcAddress (often used to hide API calls)
Found dropped PE file which has not been started or loaded
Found inlined nop instructions (likely shell or obfuscated code)
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
Installs a raw input device (often for capturing keystrokes)
Internet Provider seen in connection with other malware
JA3 SSL client fingerprint seen in connection with other malware
PE file contains an invalid checksum
PE file contains sections with non-standard names
PE file overlay found
Queries information about the installed CPU (vendor, model number etc)
Queries the volume information (name, serial number etc) of a device
Sigma detected: Browser Started with Remote Debugging
Stores files to the Windows start menu directory
Uses 32bit PE files
Uses Microsoft's Enhanced Cryptographic Provider
Uses code obfuscation techniques (call, push, ret)
Uses the keyboard layout for branch decision (may execute only for specific keyboard layouts)
Yara detected Credential Stealer
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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Code function: |
3_2_004092A6 | |
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3_2_00413AB9 | |
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Code function: |
3_2_0040B721 | |
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Code function: |
3_2_6CBC6C80 | |
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