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

Static analysis result for SHA-256 c27cf714293c496c…

MALICIOUS

Office (OOXML) / .XLSX

595.1 KB Created: 2025-03-18 21:47:22 UTC Authoring application: Microsoft Excel 16.0300
MD5: 9f6c82c240ba5ef6bb85d28c0cdf7f7f SHA-1: ccf59b2d59d975bc4fa68926b17debe88272a341 SHA-256: c27cf714293c496c8fc05b330a57bcfcb6189267e2818062660de88b0f3a25cd
208 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell

The sample is an Excel document containing VBA macros, specifically a Workbook_Open macro that utilizes the Shell() function. The document body presents a lure of traffic violations, instructing the user to enable macros for proper display. This combination strongly suggests a macro-based malware delivery mechanism. The VBA code likely downloads and executes a second-stage payload. No specific IOCs were extracted beyond the presence of VBA macros.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — VBA macros present
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
9e803332e566c9126a90b4039eeb979bb01a42508cb4193e3bd8ab0f0e283693		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2136 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
6d52ce3f56d1dda4988b55cd9623d78601754bb7cd0f5ff3578f530c6857fe0a		 vba-project OOXML VBA project: xl/vbaProject.bin 15360 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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