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

Static analysis result for SHA-256 ed569d3fc9abed62…

MALICIOUS

Office (OLE) / .XLS

44.0 KB Created: 2020-10-30 08:54:33 Authoring application: Microsoft Excel
MD5: 3a12e34a89544ca473de77010edc2a72 SHA-1: 5de125299f47a5eb77b092e4f4b4e0af2fbba787 SHA-256: ed569d3fc9abed62ff99ad2f70d2c028c8ef978f27ca2f8207f4488ec7c01bd2
60 Risk Score

Malware Insights

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

The sample is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an OLE_XLM_AUTOOPEN heuristic suggests that macros are configured to run automatically upon opening. While no specific payload or download URL was extracted, the nature of the heuristics points to a macro-based delivery mechanism for a malicious 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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