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

Static analysis result for SHA-256 1b27af50c09daedc…

MALICIOUS

Office (OLE) / .XLS

263.0 KB Created: 2020-06-03 21:26:26 Authoring application: Microsoft Excel
MD5: c1cf39026702e60374f33519b8bde06b SHA-1: 53db20be969e690c156d18a401bfff10bda14e5c SHA-256: 1b27af50c09daedcf39982a0673d8ad08261fd20c9a7d840814699a24d92a5cf
60 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled spreadsheet. The presence of the OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN heuristics indicates that the Auto_Open macro is configured to execute dangerous functions, specifically the RUN function. The embedded URL fragments, when partially reconstructed, suggest an attempt to download and execute a second-stage payload. The document body contains fragmented strings that appear to be part of a URL, further supporting the download and execution of malicious content.

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
f5ab8c1b9bf8731fb80a01d6757caa28f178bf2abcfa77d02e98a0babd19ad96		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 203658 bytes

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