Office (OOXML) / .XLSX malware analysis — malicious · d762c403d9e180be

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: e7c74dd5746a016af75a2c3cc29aae1d SHA-1: 461aacb9a2a1e99ac0b939c79c2cd78f2cbd48f8 SHA-256: d762c403d9e180be5a7a5e08fffbb60ef4c52f5e13889fc77c68414d222fb53d

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is an Excel document containing Excel 4.0 macros, which is a strong indicator of malicious intent. The macro sheet appears to be truncated, but the presence of XLM macros suggests an attempt to download and execute a secondary payload. Further analysis of the macro content is required to determine the exact execution flow and IOCs.

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` `99d84e1533c4ed1711e17d46bd10a4280dad068e883cedc29f144309e538a28e`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	315303 bytes

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