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

Static analysis result for SHA-256 bc981c90bbdceadd…

MALICIOUS

Office (OLE) / .XLS

531.5 KB Created: 2020-04-23 12:26:24 Authoring application: Microsoft Excel
MD5: ad42d010f06d86bc58c19b0737cf2ed5 SHA-1: 2d7526825d5474b3a6bbb05eaafd9b354c072025 SHA-256: bc981c90bbdceadd4932f02cb78f65860b1bf8d0c33ed25e83f46761f77b8f75
60 Risk Score

Malware Insights

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

The sample is an encrypted Excel 4.0 macro sheet, which is a strong indicator of malicious intent. The presence of an 'AUTOOPEN' macro suggests that the malicious code executes automatically upon opening the document. The encrypted nature of the macro sheet prevents further static analysis of its specific actions, but the overall pattern points to a macro-based attack.

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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