Office (OOXML) / .XLSX malware analysis — malicious · cde3c13ef07cd406

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: c98e0cbca4de54bcab623a7c836e0a10 SHA-1: cb6c47d6f51d03cddf01889324aefbe856c9f2ce SHA-256: cde3c13ef07cd4061123c97a2adaafde53fa8b41ff65a96806f1c0865d2150e5

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The sample is an Excel file containing Excel 4.0 macros. The macros appear to be attempting to execute a file path that resembles a document, specifically 'C:\ProgramData\excel.rtf'. This suggests a potential attempt to download and execute a malicious payload disguised as a document.

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` `7fcf21117339d03839f5ce53176fd53c808743453c45b1f453e4daf0d991e91f`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	134114 bytes

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