Office (OOXML) / .XLSX malware analysis — malicious · 504363f88292e4f6

MALICIOUS

Office (OOXML) / .XLSX

73.4 KB Created: 2021-10-27 10:31:49 UTC Authoring application: Microsoft Excel 12.0000

MD5: 53ddc2341db7681c053761c0a54453dd SHA-1: e13432ba6cd51801fc3daf29789818b3568d2c5f SHA-256: 504363f88292e4f6b90ee11f8b67a5825badb5cc6497b7bd1998de7e5320d5bb

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The critical heuristic firing indicates the presence of an Excel 4.0 macro sheet. The extracted macro commands indicate an attempt to execute 'mshta C:\ProgramData\excel.rtf', which suggests the macro is designed to download and execute a malicious payload from the specified path. This is a common technique for initial execution and payload delivery.

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` `67298d1c0fe351759cea2184b5d078dd4deb230e55f23e07207b4de7b1a67bdd`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	106581 bytes

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