Office (OOXML) / .XLSX malware analysis — malicious · 06387e3363cb14c2

MALICIOUS

Office (OOXML) / .XLSX

197.2 KB Created: 2021-02-27 09:36:14 UTC Authoring application: Microsoft Excel 16.0300

MD5: 3513fc5607e7e25c1dc5ceb1d3cc04ce SHA-1: 900582c62e3f617e237ee32bd9dfb08a03fce074 SHA-256: 06387e3363cb14c2fc134e8e646d9edb24b114a4e8fd74f69f41baf14e015920

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an Excel spreadsheet containing Excel 4.0 macros, a known technique for executing malicious code. The macros are likely designed to download and execute a second-stage payload, although the specific commands are obfuscated and truncated in the provided evidence. This points to a macro-based downloader, a common initial access vector.

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` `410653b7bcbe1dc91887f5e340f1fd4369c29b075781d619cea5bb13abe14b01`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	8324 bytes

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