Disclaimer: This article is for educational and legitimate recovery purposes only. Laws regarding reverse engineering vary by country. Consult an attorney before reversing any software you do not own.
While a decompiler can rarely produce a perfect, one-to-one copy of the original source—missing comments and variable names are common—the structural map it provides is invaluable. A portable VB decompiler vb decompiler portable
Old banking trojans (like Zeus or Oscarbot ) often used VB6 for quick prototyping. The portable version allows you to analyze a sample on an air-gapped laptop via USB without "infecting" the analysis environment with installation logs. Disclaimer: This article is for educational and legitimate