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

Static analysis result for SHA-256 6691a0b2813208cf…

MALICIOUS

Office (OLE) / .XLS

399.5 KB Created: 2016-11-08 08:33:09 Authoring application: Microsoft Excel First seen: 2022-08-01
MD5: 4f929964e5e9229ed391f04a68e8c6e2 SHA-1: 1c3c2de68d70452a4594b91960dbd79bdc95f89f SHA-256: 6691a0b2813208cfcc511d8ee3e7a69d770b7c8fb3a22e180abaf186ecbe125b
228 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1140 Deobfuscate/Decode Files or Information T1204.002 Malicious File

The sample is an Excel file containing VBA macros that leverage WScript.Shell and CreateObject to download and execute a payload. The script reconstructs a base64 encoded string from cells in the 'Final Offer' sheet, decodes it, and saves it as 'nvidiax.exe' in 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

Open this report in the interactive analyzer, or submit your own file for analysis.