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

Static analysis result for SHA-256 65471894cbee379f…

MALICIOUS

Office (OLE) / .XLS

183.0 KB Created: 2020-11-10 04:26:51 Authoring application: Microsoft Excel
MD5: 368b30851a0ea751ffe4654eee024852 SHA-1: fab516b517195287d86b5ea965de3523e5496f71 SHA-256: 65471894cbee379f974338982a47f5cd9eeb2ee9c82f56621b216fac8b815605
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet that is encrypted, indicated by the 'OLE_XLM_ENCRYPTED_MACROSHEET' heuristic. The presence of an 'OLE_XLM_AUTOOPEN' heuristic suggests that the macro sheet is designed to execute automatically when the workbook is opened. Due to the encrypted nature, the specific payload could not be determined, leading to an unknown family and no specific IOCs.

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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