Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 d733b583dee6a8dc…

MALICIOUS

Office (OOXML) / .XLSX

113.8 KB Created: 2020-06-23 11:38:23 UTC Authoring application: Microsoft Excel 16.0300
MD5: 989ef7a5d276a5b631205c693353f31f SHA-1: 0b76f84e2f11bdb710df9f09786d9713dda35c59 SHA-256: d733b583dee6a8dc62df9689b6db722095153c1181c095a115e493d358b2c2ef
68 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File T1059.005 Visual Basic

This XLSX file contains an Excel 4.0 macro sheet, which is a strong indicator of malicious intent as legitimate use is rare. The presence of a macro-enable lure further supports this, as it's a common technique to bypass security measures. While no specific payload URLs or scripts were extracted, the combination of these heuristics suggests the file is designed to download and execute a secondary payload upon user interaction. The file's SHA256 hash is provided as a primary IOC.

Heuristics 4

  • Excel 4.0 macro sheet (1 sheet(s)) high 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 30 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/spreadsheetml/2006/main
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac
    • http://schemas.microsoft.com/office/spreadsheetml/2014/revision
    • http://schemas.microsoft.com/office/spreadsheetml/2015/revision2
    • http://schemas.microsoft.com/office/spreadsheetml/2016/revision3

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.xml
6f4aed1ae96430b09ce4437ce30fffe68b891f4c121f1aa8abf5bd208f469115		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 166393 bytes

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