Office (OOXML) / .XLSX malware analysis — malicious · 6c4c00769f61551a

MALICIOUS

Office (OOXML) / .XLSX

106.6 KB Created: 2020-11-22 22:46:37 UTC Authoring application: Microsoft Excel 16.0300

MD5: 954644e5e5b148623b7adab25a8e7c36 SHA-1: df6d5ae7d2a157031966a121341b0167caaf9299 SHA-256: 6c4c00769f61551afead23c00c12cb998de7dd1b5f5a286e6aa29a82da215993

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The file contains an Excel 4.0 macro sheet, identified by the OOXML_XLM_MACROSHEET heuristic. This macro sheet likely contains obfuscated commands intended to download and execute a secondary payload, a common technique for initial execution and payload delivery. The specific commands are heavily obfuscated, preventing a more detailed analysis of the payload's destination or function.

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` `1779ff1c55a67ccdfc21a0834594da4dbe8705905822c7b60ba8df4de573f09f`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	95694 bytes

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