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

Static analysis result for SHA-256 eb999aa4f1e79ed8…

MALICIOUS

Office (OLE) / .XLS

991.5 KB Created: 2020-06-07 20:54:19 Authoring application: Microsoft Excel
MD5: f014578ff2be67d5999595d49c11a868 SHA-1: c9f557712bdc91d3954d417edae661c356076e99 SHA-256: eb999aa4f1e79ed883460285525c7116bb1d771462da92af870b61b9f5afc2d5
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The presence of an OLE_XLM_AUTOOPEN heuristic firing indicates that this Excel file contains Excel 4.0 macros. The OLE_XLM_DANGEROUS_FN firing, specifically mentioning the RUN function, suggests these macros are designed to execute arbitrary code. The reconstructed URL from the document body, 'http://blueciroyx.manwdkURLMONDFAJCSEgvg\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', is highly suspicious and likely serves as a download location for a secondary payload. The file's purpose is to leverage these macros to initiate a malicious download chain.

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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
da39a56c32774a2da745744750651585a27bfe9ed42418eafb3fd98edfba7253		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 103210 bytes

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