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

Static analysis result for SHA-256 8dfff9a2ff5cb2b8…

MALICIOUS

Office (OLE) / .XLS

318.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 540499ef024a652fea8780e11398f03c SHA-1: 33da766338fa9fd840b1f43a6330a0af8cfa0a39 SHA-256: 8dfff9a2ff5cb2b8d70cf43fd0dc7a521570105d623cf28b76f8c66a9a664dd6
120 Risk Score

Malware Insights

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

The critical ClamAV heuristic and high-severity heuristic for dangerous XLM Auto_Open functions indicate malicious macro activity. The presence of an embedded URL and the XLM Auto_Open function with the RUN API strongly suggest the macro is designed to download and execute a second-stage payload from the provided URL. The document body text is minimal and does not provide further context on the lure.

Heuristics 4

  • ClamAV: Doc.Downloader.Docusign0521-9864805-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Docusign0521-9864805-0
  • 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 https://remedial.aaua.edu.ng/ds/1502.gif�
    • https://remedial.aaua.edu.ng/ds/1502.gif

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
fefece9127c35e2a9dbe91bfa66ed0ec5923eeac8572c5b22807ea99e41abfae		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 4374 bytes

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