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

Static analysis result for SHA-256 c8dc8ebef199b27a…

MALICIOUS

Office (OLE) / .XLSX

39.0 KB Created: 2020-09-28 00:53:43 Authoring application: Microsoft Excel
MD5: 784e9a829c4afccf7ea33e96edcd5ba3 SHA-1: 7c9de4801715134cdafb6220f45325aeaa1bf08e SHA-256: c8dc8ebef199b27a854ec7ec33d76a15ac7d8cfbd1ba7afa3dc48d9332e90f92
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel file containing encrypted Excel 4.0 macros, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET and OLE_XLM_AUTOOPEN heuristic firings. The presence of encrypted macros strongly suggests an intent to execute arbitrary code. The document body is heavily obfuscated and truncated, preventing a more detailed analysis of its specific purpose or payload.

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.

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