Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 0c6fbc4ac8edfcae…

MALICIOUS

Office (OOXML)

112.9 KB Created: 2021-02-03 15:28:44 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-06-13
MD5: 79af9404c46fa7aa7cc6d8b25ae518d0 SHA-1: 72511d8ed8800979fea6186300c8c73c7582ae93 SHA-256: 0c6fbc4ac8edfcaeb88faea02364be291115422f01433a5fa969ef15c7601628
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is identified as an Excel 4.0 macro sheet, which is a known method for executing arbitrary commands. The presence of disguised relationships further indicates malicious intent. The macros are likely designed to download and execute a secondary payload.

Heuristics 2

  • Excel 4.0 macro sheet (1 sheet(s)) critical 1 related finding OOXML_XLM_MACROSHEET
    Spreadsheet contains an Excel 4.0 (XLM) macro sheet — XLM was a major Office malware vector during 2020-2022 and evaded many VBA-focused controls before Microsoft tightened XLM defaults. Even legitimate XLM use is rare in modern workbooks. The macro sheet is stored as XLSB/BIFF12 binary content, which many XML-only OOXML scanners miss.
  • Excel 4.0 macro sheet stored under disguised package path critical OOXML_XLM_DISGUISED_RELATIONSHIP
    OOXML package declares an xlMacrosheet relationship whose target is outside the canonical xl/macrosheets/ path. Excel follows the relationship type, while path-only scanners can miss the macro execution surface.

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