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

Static analysis result for SHA-256 5e092f61cada6094…

MALICIOUS

Office (OLE) / .XLSX

207.5 KB Created: 2020-09-24 19:32:47 Authoring application: Microsoft Excel
MD5: f63dbaa682cfc44f1d19f2c77ba57899 SHA-1: 8f02948bd39390ce23222aefee5540cbe1649e53 SHA-256: 5e092f61cada609429f9709fee099188175e94cd5e083ef1ece92474096edb0a
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file contains an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an AUTOOPEN macro suggests that the malicious code is designed to execute automatically upon opening the spreadsheet. This is a common technique for delivering malware through phishing attachments.

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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