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

Static analysis result for SHA-256 adede1736b6568eb…

MALICIOUS

Office (OLE) / .XLS

188.0 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel
MD5: 7cbc3c918bfde65b1ef7ed10c2de0fdf SHA-1: 1a90b86112486f22b602c8887b727a0fe3afaac6 SHA-256: adede1736b6568eb42ded08ed1453f2b9602b55b185873a54ee85449ba2b069f
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample is an Excel 4.0 macro-enabled spreadsheet. Heuristics indicate the presence of an Auto_Open macro that utilizes dangerous functions, specifically 'RUN'. This suggests the macro is designed to execute arbitrary commands. The document body contains a suspicious URL that could be used to download a secondary payload. The confidence is high due to the clear indicators of macro execution and the presence of a potentially malicious URL.

Heuristics 4

  • 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.
  • 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 http://www.iec.ch
    • http://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://ns.adobe.com/photoshop/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
71504be57c3b61dc81c013f2a3104925b4fcad3d45ffa13d45e0c2950cc21487		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 7928 bytes

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