Office (OOXML) / .XLSX malware analysis — malicious · 2ccf743250286332

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: f7785a8150bf9fe51cb48c6a3bcf3703 SHA-1: 64871f6d22b913ac6f19dbd0479dd115a7e6fd18 SHA-256: 2ccf743250286332ea78b3ece18b59bd15744b0356234dead79eac52091af298

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is an Excel document containing Excel 4.0 macros. The heuristic firing indicates the presence of these macros, which are often used to download and execute further stages of malware. No specific IOCs were extracted from the macro content due to its obfuscated and truncated nature, leading to a lower confidence in family attribution.

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` `ded749fd689a6eb5b1cad00e58b6fdff0a628d04291e63b7bfbbceb8abeedc23`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	7020 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.