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

Static analysis result for SHA-256 628eea51977182df…

MALICIOUS

Office (OLE) / .XLS

216.0 KB Created: 2020-09-16 03:49:16 Authoring application: Microsoft Excel
MD5: 40df381bd7aa2d77004ba5384d6653f5 SHA-1: ae52f07c551fad5e4ed2bbdf561bf0917f1b90d5 SHA-256: 628eea51977182df317b2811847eb08c2a4a4ef7b1a216b0e65d759a07dc3979
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet that is encrypted, which is a strong indicator of malicious intent. The presence of macro sheet BOF markers further supports this. Without a document body or script content, the exact payload and delivery mechanism remain unclear, leading to an unknown family classification.

Heuristics 2

  • Encrypted Excel 4.0 macro sheet high OLE_XLM_ENCRYPTED_MACROSHEET
    Workbook contains an Excel 4.0 macro sheet and BIFF FILEPASS encryption. Password-protected XLM macro sheets, especially the default Excel password path, are a common malware evasion pattern because static formula extraction may fail until the workbook is decrypted.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

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