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

Static analysis result for SHA-256 c477cae894cb7ebb…

MALICIOUS

Office (OLE) / .XLS

260.0 KB Created: 2007-05-02 03:25:34 Authoring application: Microsoft Excel
MD5: 2d81944cdec4d443c975a607f4e42a9f SHA-1: d78b2a6d4b3060a84b28a4e88936c1e1aaf3033e SHA-256: c477cae894cb7ebb0fbecb67e7d479129c1601c40b5750dc06aaeeccdd1e4400
120 Risk Score

Malware Insights

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

The file contains legacy Excel 4.0 (XLM) macros, indicated by the OLE_XLM_AUTOOPEN and OLE_XLS_FORMULA_MACRO_VIRUS heuristics. The OLE_XLM_DANGEROUS_FN heuristic specifically flags the use of dangerous formula APIs, including the 'RUN' function, which can be used to execute arbitrary commands. The presence of these indicators strongly suggests a malicious intent, likely to download and execute a secondary payload or perform other harmful actions on the victim's system. The document body content appears to be a product list, which may serve as a lure.

Heuristics 4

  • Legacy Excel formula macro virus marker critical OLE_XLS_FORMULA_MACRO_VIRUS
    Workbook stream contains self-identifying legacy Excel formula macro virus markers. This indicates the document carries formula macro virus content even when no VBA project or modern XLM macro-sheet structure is present.
  • 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://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/iX/1.0/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
91b406ebf150b346f0b1a3070ff3ab5318c80d134897b52a1e3abcd54161f5fd		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 185281 bytes

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