Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 65b7ed59955cc368…

MALICIOUS

Office (OLE)

70.5 KB Created: 2020-04-15 05:50:52 Authoring application: Microsoft Excel
MD5: 4fcc51343ef3af921b117d76f449bb51 SHA-1: 5ea18e85ca36ae3a7686b5059f1233e759fd57b7 SHA-256: 65b7ed59955cc3685725cc6d8811ed9b937e51fa4e42032775dbfbe8e04e6edd
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The presence of encrypted Excel 4.0 macros (OLE_XLM_ENCRYPTED_MACROSHEET) strongly suggests that this document is designed to execute malicious code upon opening. The AUTOOPEN heuristic further confirms the presence of an auto-executing macro. While the specific payload is not visible due to encryption, the overall pattern points to a downloader or droppper malware.

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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