Office (OOXML) / .XLSX malware analysis — malicious · 1785380ea3e5970d

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 21d1ee7daa923f1243d4f757cfde71f6 SHA-1: 952cd21bec9e397b5ccea4cd57cec347a3150303 SHA-256: 1785380ea3e5970dce00c09a47348406169b06d183ad95c3b75d3a01c53e2d7b

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is an Excel spreadsheet containing Excel 4.0 macros, indicated by the OOXML_XLM_MACROSHEET heuristic. These macros are designed to execute arbitrary commands, which is a common technique for delivering further malicious payloads. The specific actions of the macros could not be fully determined due to truncation in the provided evidence.

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` `ccc1f8bf20aaaf88db387c6f3739eed84b81fb6aa68fcefee5de0520dc3b4c15`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	365752 bytes

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