MALICIOUS
100
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
The sample is an Excel file containing encrypted Excel 4.0 macros, as indicated by multiple high-severity heuristic firings. The presence of an 'AUTOOPEN' macro suggests that malicious code is intended to execute automatically when the spreadsheet is opened. The document body is heavily obfuscated and truncated, preventing a more detailed analysis of its specific purpose.
Heuristics 3
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Encrypted Excel 4.0 macro sheet high OLE_XLM_ENCRYPTED_MACROSHEETWorkbook 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.
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OLE metadata lists many Excel 4.0 macro sheets high OLE_XLM_DOCPROPS_MACROSHEET_INVENTORYWorkbook contains a BIFF Excel 4.0 macro-sheet marker and its clear OLE DocumentSummaryInformation stream lists many MacroN sheet titles. This is a useful static signal when FILEPASS encryption prevents formula extraction from the workbook stream.
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Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPENWorkbook 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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