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

Static analysis result for SHA-256 d20dcf3870fa1415…

MALICIOUS

Office (OLE) / .XLSX

357.0 KB Created: 2020-11-28 13:42:19 Authoring application: Microsoft Excel
MD5: e9d07f300697039a9870b0a324f1a44a SHA-1: 24c11515e067870b45f92b06ec61dcfc67f07fea SHA-256: d20dcf3870fa141517c27ebfef79d106dcb5b3a11d0a6a0e352a6417bb4049d9
80 Risk Score

Malware Insights

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

The sample is an Excel 4.0 workbook containing an Auto_Open macro that utilizes dangerous functions, including a URL shortener. This suggests the macro is designed to download and execute a secondary payload from the provided URL. While the URL itself is currently flagged as benign, the macro's functionality indicates a malicious intent.

Heuristics 4

  • 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.
  • XLM workbook contains URL shortener medium OLE_XLM_URL_SHORTENER
    Workbook contains an Excel 4.0 macro-sheet marker and visible URL-shortener targets in the OLE bytes. This is a common XLM downloader shape even when formula recovery is incomplete.
  • 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/4q2y4afm�
    • http://tinyurl.com/4q2y4afm

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
8028d9851d580b26361da193edc2dbf7e69cb6a8488e17de49e04452f52c2cc6
xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2143 bytes