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

Static analysis result for SHA-256 2278def4f8e8f148…

MALICIOUS

Office (OLE) / .XLSX

326.5 KB Created: 2020-07-02 12:55:44 Authoring application: Microsoft Excel
MD5: e2b12b4706e45f8840111466a7c39acc SHA-1: bee220e25b9a8fadd817db650ef5738d0647bb66 SHA-256: 2278def4f8e8f1488b022ef450b535d15fa9762987c472b5124898070d1e4b77
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The critical ClamAV heuristic indicates this is an Excel 4.0 macro sheet, specifically detected as Xls.Dropper.Agent-8734463-0. The presence of encrypted and auto-open XLM macros strongly suggests the file's purpose is to execute malicious code upon opening. The heuristic firings point to a dropper functionality, likely intended to download and execute a secondary payload.

Heuristics 3

  • ClamAV: Xls.Dropper.Agent-8734463-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8734463-0
  • 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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