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

Static analysis result for SHA-256 dbd44b9aee1cea9e…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 37b1049a986c7791b11951110cf3308a SHA-1: be6d1984a9253bf9ae28e685163a54871a66f6e9 SHA-256: dbd44b9aee1cea9e0f7bc626817bcf095cbe1bb98efc636ae2769b6a0e4b3983
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 sample is an Excel file containing Excel 4.0 macros, specifically triggering an Auto_Open function that utilizes dangerous APIs like RUN. The heuristics indicate that the macro attempts to execute external code via ShellExecute. The embedded URLs likely serve as the source for downloading a second-stage payload, consistent with a downloader malware.

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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