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

Static analysis result for SHA-256 474f8296b90c81e6…

MALICIOUS

Office (OOXML) / .XLSX

109.3 KB Created: 2020-06-23 11:38:23 UTC Authoring application: Microsoft Excel 16.0300
MD5: b2cdf325a0344cd5243ddfd864250fac SHA-1: 7557f0c0fd19bbea5560634e5e12c40453bb1818 SHA-256: 474f8296b90c81e60ca801a73e87e368856a5751915cb747a2f85f3c733892b0
68 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.005 Command and Scripting Interpreter: Visual Basic

The file is an Excel workbook containing Excel 4.0 (XLM) macros, which is a significant indicator of malicious intent given its rarity in legitimate documents. The presence of hidden worksheets and a macro-enable lure further supports this. The embedded URL 'http://schemas.micr' is of unknown reputation and is the only IOC extracted. The XLM macros are likely designed to execute a payload, but the specific actions are not detailed in the provided evidence.

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 26 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.micr
    • 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

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