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

Static analysis result for SHA-256 288f14ee55994cb2…

MALICIOUS

Office (OLE) / .XLSX

319.0 KB Created: 2020-07-02 12:55:44 Authoring application: Microsoft Excel
MD5: d54598cd3d90b54b0538753498940a05 SHA-1: 54c88d3a35bfc7e35b573b93d657eedb130711eb SHA-256: 288f14ee55994cb26a64ee495228729a822a436c8f688a76c384636ca75f60a9
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The critical ClamAV heuristic firing indicates this is a known malicious Excel dropper. The presence of encrypted Excel 4.0 macros (OLE_XLM_ENCRYPTED_MACROSHEET) strongly suggests the file is designed to execute malicious code upon opening. The document body was not parsable, but the macro sheet structure is sufficient evidence for a dropper classification.

Heuristics 3

  • ClamAV: Xls.Dropper.Agent-8803239-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8803239-0
  • 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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