Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c108074347e6219e…

MALICIOUS

Office (OLE)

497.0 KB Created: 2020-05-25 21:33:40 Authoring application: Microsoft Excel First seen: 2020-08-10
MD5: 7359cb3a5320189a77cd778ffe887a50 SHA-1: 759ff022018e6506fc74f1ca7f6dbcf1e4d17690 SHA-256: c108074347e6219e09ea228bfc4ad29deba3ca9af27edbe61e513d08c59304f4
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is identified as an encrypted Excel 4.0 macro sheet, which is a strong indicator of malicious intent. The presence of an 'AUTOOPEN' macro further suggests that the file is designed to automatically execute code when opened. Without further deobfuscation or script content, the exact payload and delivery mechanism remain unclear.

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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