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

Static analysis result for SHA-256 548a6bebf309c32e…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 987ba1d171f531fc18ae5e0a44142a12 SHA-1: a3e7ec2aad17ada21b735707d2926a5baa7f6b19 SHA-256: 548a6bebf309c32e420585dd1f312d287e35d9b5f2d5bcb80c0a9a2e0c1da49a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059.001 PowerShell T1105 Ingress Tool Transfer

The file contains Excel 4.0 macros, specifically triggering Auto_Open with dangerous functions like RUN. The presence of ShellExecute API calls and embedded URLs suggests a downloader functionality. The XLM macros likely execute code to fetch and run a secondary payload from the provided URL, indicated by the 'Doc.Downloader' ClamAV detection name. The document body text is minimal and does not provide further context on the lure.

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://jpsteel.in/ds/261120.gif
    • https://jpsteel.in/ds/261120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
0d33d3f7accc92fdd60dbf912082de478929da664f047bbfbed4791982921d46		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6676 bytes

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