Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 fcbb39a7bcc77cec…

MALICIOUS

Office (OLE) / .XLS

399.5 KB Created: 2016-11-08 08:33:09 Authoring application: Microsoft Excel First seen: 2022-08-01
MD5: bff778fc4fbaa10eb5a1c3199a1ad971 SHA-1: 593ef3393e2fbc5b2ccd3242f9c2a44a1ed4f5da SHA-256: fcbb39a7bcc77cec9caed3e832f89fbe824af296e5500a50095308fc58ff8863
228 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1059.003 Windows Command Shell T1140 Deobfuscate or Obfuscate T1204.002 Malicious File T1036.005 Match Legitimate Name or Location

The sample is a macro-enabled Excel file that attempts to trick the user into filling out a form with personal and financial details. The VBA script contains a critical 'Shell()' call and uses 'WScript.Shell' to download and execute a Base64 encoded payload named 'nvidiax.exe' from the document body into the temporary directory. This indicates a downloader or droppper functionality.

Heuristics 6

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
54ba713ab254cfd6176a4b8846c3b0962e2e7a2f34b5c1107ba20bf283bf1595		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 7094 bytes

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