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

Static analysis result for SHA-256 d0ded20fd3c16f11…

MALICIOUS

Office (OLE) / .XLS

41.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 5eb2a44dfcad85ce322bc14430b8a652 SHA-1: 88e528f14355f64b04ecf3b4937d606d8163ff70 SHA-256: d0ded20fd3c16f1151205165c0f0d8e719d1c6289c3077e20469d958f27cf7b6
140 Risk Score

Malware Insights

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

The sample is an Excel 4.0 macro-enabled spreadsheet. Heuristics indicate the presence of an Auto_Open macro, which is a common technique for executing malicious code upon opening the document. The macro sheet contains references to dangerous functions like RUN, suggesting it is designed to execute arbitrary commands.

Heuristics 3

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
d0489edecac89e64206eade3c50ae3a3f2ecd342c38a141d6c4ccf47afc6a58d		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 7914 bytes

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