Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 69f93b8727e96fa3…

MALICIOUS

Office (OOXML)

62.0 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-06-17
MD5: ac4f72de702d20fa91a780026f409325 SHA-1: 1f5f84efac222661cbc466878e3ddcdfe76e8234 SHA-256: 69f93b8727e96fa3ea824c7893c28e9f94ce39e4de3c10537b479856a33b2fa7
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The critical heuristic firing indicates the presence of Excel 4.0 macros, which are known to be used for malicious purposes. These macros can execute arbitrary commands, serving as a common method for initial access through spearphishing attachments. No specific family could be identified from the available evidence.

Heuristics 1

  • Excel 4.0 macro sheet (1 sheet(s)) critical 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.bin xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet1.bin 1811 bytes
SHA-256: c03a19a43999132e3e943a64d9f09c145c1ff1f3e7ec64136db086ccbbd870ca
Preview script
First 1,000 lines of the extracted script
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