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

Static analysis result for SHA-256 25939bbff1476295…

MALICIOUS

Office (OLE) / .XLS

72.5 KB Created: 2020-10-22 22:27:07 Authoring application: Microsoft Excel
MD5: cf6ed76e541b6a7fc83af15992c0d94a SHA-1: 48506639fb4e4997bc2f8a43db93394eede1a78a SHA-256: 25939bbff1476295b997e3284f1b3d06cda662222ff87943f726730d434e5718
68 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell

The sample is an Excel file containing Excel 4.0 macros, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN heuristics. The OLE_XLM_DANGEROUS_FN heuristic specifically flags the use of dangerous API functions like RUN, suggesting the macro attempts to execute arbitrary commands. Although the embedded URL is marked as likely benign, the presence of XLM macros with execution capabilities is a strong indicator of malicious intent, likely to download and execute a second-stage payload.

Heuristics 4

  • 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.
  • VBA project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.
  • 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://tinyurl.com/yxjcquxy

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
38df0ef713f8a44f156678caaf85503869a94b046d4977325c765c62ef71cc46		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 785 bytes
macros.bas
2d24921e10e203960452582f281cf8f8c4ffa9c8fc40bd7c703a4b9213addbc6		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 606 bytes

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