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

Static analysis result for SHA-256 9c4b56adc07fedc2…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 6956e483e5ed8d8ebcd409290da0b486 SHA-1: 436fb01205b1b74f6b394c4dcebb0aaa76a76d93 SHA-256: 9c4b56adc07fedc2b103a99a4aacb6d0cdb7ec348fad81ffc0cccd61f086fb23
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is an Excel 4.0 (XLM) macro sheet, identified by the OLE_XLM_AUTOOPEN heuristic. The presence of ShellExecute API calls and dangerous XLM functions like RUN indicates that the macro is designed to execute external code. The embedded URL likely serves as the source for a second-stage payload, consistent with a downloader's behavior. The ClamAV detection name 'Doc.Downloader.Docusign0521-9864805-0' further supports this assessment.

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 https://boatssa.com/ds/231120.gif
    • https://boatssa.com/ds/231120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
96eae7b570d4a9d4f225045676982008ec43ffa50f8643e2397db329f3c9bb6b		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6059 bytes

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