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

Static analysis result for SHA-256 1d68434b591110cd…

MALICIOUS

Office (OLE) / .XLS

154.0 KB Created: 2020-11-28 13:42:19 Authoring application: Microsoft Excel
MD5: d24625e30b351be950a8d709b77871a7 SHA-1: 292bb6d374398c746722924b209fc043bf0e47a2 SHA-256: 1d68434b591110cdabe1af690f1a01dc209ceb432eb7b89b24e3d5c9f43d3338
60 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled spreadsheet. Heuristics indicate the presence of an Auto_Open macro that uses dangerous functions, specifically the RUN function, which is highly suspicious. The embedded URL, although marked as benign, is present in the document body and is likely used to download and execute a second-stage payload. The macro sheet's structure and the use of the RUN function strongly suggest an attempt to execute arbitrary code.

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://tinyurl.com/y2bthpxg�
    • http://tinyurl.com/y2bthpxg

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
7c2678d75e0ddfde7f2edbeeb8ea56469f7eac43f1a6c8790b68fbbe7e1076e4
xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1263 bytes