bazarloader

BazarLoader is a malware loader that has been observed exploiting the Windows App Installer (ms-appinstaller/AppInstaller.exe) to deliver AppX packages. This attack chain, sometimes called a 'call me back' campaign, uses signed-looking app packages to install BazarBackdoor. Execution relies on living-off-the-land binaries such as regsvr32, PowerShell, and msedge, while command-and-control traffic is hidden in cookies to evade detection. The technique bypasses simple file-based security controls and highlights weaknesses in digital signature validation on Windows systems. Discussions on WindowsForum cover the technical details of this stealthy delivery method and its implications for enterprise security.