Office (OOXML) / .XLSX malware analysis — malicious · 375db27c2c15e970

MALICIOUS

Office (OOXML) / .XLSX

233.7 KB Created: 2021-03-05 04:08:28 UTC Authoring application: Microsoft Excel 16.0300

MD5: e8ed2efcde01049b021e6213a2178c75 SHA-1: 78f7c860d1858a25231fed52b1b082215ef19525 SHA-256: 375db27c2c15e970c309084fb9f9d33624442bf4040740443a5ccbedaa4075ca

120 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is an Excel spreadsheet containing Excel 4.0 macros, as indicated by the OOXML_XLM_MACROSHEET heuristic. The ClamAV detection further confirms its malicious nature as a downloader. While the macro content is truncated, the presence of Excel 4.0 macros strongly suggests an attempt to download and execute a second-stage payload. The specific download URL or execution method could not be determined due to the truncated script.

Heuristics 2

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.
ClamAV: Doc.Downloader.Trojan-bf70f023603538ee-bf70f023603538ee-9950269-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Trojan-bf70f023603538ee-bf70f023603538ee-9950269-0

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_sheet_00.bin` `c7188335cd10cb2e817640b38192302d3c11e7f2c8d75ae87c08885a15e2a60d`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	11364 bytes

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