Office (OOXML) / .XLSX malware analysis — malicious · 1192c8258677ec4e

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 10b0184b71b8ca71a57b1e12a1e63b1c SHA-1: f94f05cd9cb0e053eaae9be55a47af72f174dc3f SHA-256: 1192c8258677ec4e2ca2aff3b9c09c33ecd5247f30f0c16033de1084de08d61d

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is an Excel spreadsheet containing Excel 4.0 macros, indicated by the OOXML_XLM_MACROSHEET heuristic. These macros are designed to execute arbitrary commands, a common technique for downloading and executing further malicious content. The specific commands within the macro sheet are truncated, preventing a more detailed analysis of the payload or destination.

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` `561ea43a2515323440271850acf4f6b74f22f04d736d8de267bf7937466f965e`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	8324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.