Malware Analysis: payloadfinal.bin (Agent Tesla)

The analysis of "payloadfinal.bin" reveals it is a variant of Agent Tesla, a well-known form of malware that primarily targets Windows systems. This particular sample exhibits several sophisticated techniques aimed at evading detection while stealing sensitive information from compromised machines.

Key Features and Capabilities

1. Credential Stealing:

   • The malware employs a robust credential harvesting mechanism to steal saved passwords and credentials from various applications, including web browsers, email clients, and FTP clients.
   • It uses the uGY5R.smethod_0() function to iterate through targeted applications and extract stored credentials.

2. Defense Evasion:

   • The malware includes multiple layers of defense evasion techniques designed to avoid detection by security tools:
     • Virtual Machine Detection: Utilizes WMI queries to detect if it is running in a virtual environment, such as VMware or VirtualBox.
     • Sandbox Detection: Checks for the presence of known sandbox DLLs like SbieDll.dll, SxIn.dll, and others.
     • Timing Check: Uses Thread.Sleep timing checks to identify fast-forwarding by sandboxes.
     • SSL Bypass: Disables SSL certificate validation, allowing it to bypass HTTPS

Read the full article at InfoSec Write-ups - Medium

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