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

Static analysis result for SHA-256 d8b0f659e4a05742…

MALICIOUS

Office (OLE) / .XLSX

329.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: b04ecf648f2d79a6606324b0e84b7e47 SHA-1: d77ae7c550baf3c3d65bde685f2377bfbc9b8f6e SHA-256: d8b0f659e4a057423fd506bb5a7143ab7ce7cc318e383d38af7fc873af1fd2b6
160 Risk Score

Malware Insights

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

The file contains an Excel 4.0 macro (XLM) with an Auto_Open function that utilizes dangerous APIs like RUN. This macro is designed to execute a payload, indicated by the ShellExecute API reference and the embedded URL. The ClamAV detection name 'Doc.Downloader.Docusign0521-9864805-0' further suggests a downloader functionality. The macro likely attempts to download and execute a second-stage payload from the provided URL.

Heuristics 5

  • ClamAV: Doc.Downloader.Docusign0521-9864805-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Docusign0521-9864805-0
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • XLM Auto_Open with dangerous formula APIs high OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
  • 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://i.sfu.edu.ph/ds/161120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
e17e7cc4a238aa7ef2e84a739a77bbc946bb2881b6aa82203097e9ab8210d20f		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6273 bytes

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