Office (OOXML) / .XLSX malware analysis — malicious · 0e796b67f848a9f9

MALICIOUS

Office (OOXML) / .XLSX

81.3 KB Created: 2021-02-26 07:53:41 UTC Authoring application: Microsoft Excel 16.0300

MD5: 1c95f54b09e216668f402e6020097579 SHA-1: fbff85459b12311023848dde95faf9d3b005b0c6 SHA-256: 0e796b67f848a9f97359180ef60acc8f16a45c781af1001c02924d0be104c72e

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The critical heuristic firing indicates the presence of Excel 4.0 macros within the XLSX file. These macros are capable of executing arbitrary commands, which is a common technique for downloading and executing further malicious stages. The specific commands executed by the macros could not be fully determined due to truncation, but the presence of XLM macros strongly suggests an attempt to compromise the user's system.

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` `77f0b22c8995d91f90ce66783a4ef1f0f403077c5e2863499e0092a2413eaef7`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	4569 bytes

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