Office (OOXML) / .XLSX malware analysis — malicious · ab9ee3ab5b96f796

MALICIOUS

Office (OOXML) / .XLSX

375.8 KB Created: 2021-08-16 09:36:27 UTC Authoring application: Microsoft Excel 12.0000

MD5: cb69bff05888a366bf8e5d7fd5c88076 SHA-1: 48a382afea4cf56aa5224d657051ee285cacf96d SHA-256: ab9ee3ab5b96f7963cc7eea4e99db84b981c79121f5ef21abe05443714c539d6

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is an Excel spreadsheet containing embedded Excel 4.0 macros. The heuristic firing indicates the presence of these macros, which are often used to download and execute malicious payloads. The macro content is heavily truncated and obfuscated, preventing a more detailed analysis of its specific actions or IOCs.

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.

Filename	Kind	Source	Size
`xlm_sheet_00.bin` `24b186b274d21da5522bc9b4b51a40af1dc98d8e9a02dacbcf1cc4567002438b`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	655076 bytes

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