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

Static analysis result for SHA-256 d6cc8bb9fb94ae2a…

MALICIOUS

Office (OLE) / .XLSX

188.0 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel
MD5: da5de746eedc1d8b6ce299e62c11d822 SHA-1: fd2ec0a01305c9ec7a81bbf34bbb802649c0f72a SHA-256: d6cc8bb9fb94ae2a9b12e15db534cb5c021c37fc104b46c7db8096e1f1108740
60 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open macro that utilizes the RUN function to execute a formula. This formula points to a URL that likely serves as a downloader for a second-stage payload. The presence of the Auto_Open macro and the use of the RUN function are strong indicators of malicious intent, aiming to execute arbitrary code upon opening the document.

Heuristics 3

  • 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 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
38d60eee1e29da7937e8bf9335454756ac61c75039052a56c57ef465d2528720		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 11679 bytes

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