Office (OOXML) / .XLSX malware analysis — malicious · a28ad733503ce285

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 9b870b29feb59e068e36322768028a0b SHA-1: 69e76a29393347424053a21da9a6a52c681ec7bd SHA-256: a28ad733503ce285489c9e997a320b1e411e5990242bc77fbf70393820c501e8

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The critical heuristic firing indicates the presence of Excel 4.0 macros within the XLSX file. These macros are known to be used for executing arbitrary commands, often as a delivery mechanism for further malicious payloads. The truncated script content prevents a more detailed analysis of the specific commands being executed.

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` `57c6f05fb5a16d3560058c78d332ad32f7118e8dd6949d171baf22237911f1f6`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	242195 bytes

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