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

Static analysis result for SHA-256 3645befaf98b046f…

MALICIOUS

Office (OOXML) / .XLSX

103.7 KB Created: 2020-06-23 11:38:23 UTC Authoring application: Microsoft Excel 16.0300
MD5: cf684979e28ae1fc8aea0c61514e7344 SHA-1: b5a9880c661b309da8f5258b0cfe034f678813c0 SHA-256: 3645befaf98b046f5c5fcb99ec2e62d358a911b2d3da2154cbe75d28d26934fa
68 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.005 PowerShell

The sample is an Excel file containing an Excel 4.0 (XLM) macro sheet, which is a technique commonly used to bypass modern macro security. It also contains hidden worksheets and a macro-enable lure, indicating an attempt to deceive the user into running malicious code. The presence of an XLM macro sheet suggests the potential for downloading and executing a secondary payload, although no specific URLs or scripts were extracted to confirm this. The confidence is moderate due to the lack of concrete payload indicators.

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 15 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

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