Office (OOXML) / .XLSX malware analysis — malicious · 2ee523a8460bbf4f

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 569dd0b1ac6f13f30b45607323691fb7 SHA-1: 1cd5125bb6fe5e632763a870ccccd2ceaf2b672e SHA-256: 2ee523a8460bbf4ff52f41a6a4136ae43ea3ed8ee9fdfce3b525c156b0463212

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The sample was identified as malicious due to the presence of Excel 4.0 macros. The macro sheet contains obfuscated strings that, when reconstructed, appear to reference a file path 'C:\ProgramData\excel.rtf', suggesting an attempt to write or execute a payload from this location. The specific intent of the macro is to execute arbitrary commands, likely for initial 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` `e30d1a89845c45b3daf572e2aa11a70377d2bccc42a654c0bc48d83e55793679`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	107550 bytes

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