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

Static analysis result for SHA-256 f6079cde5ac52325…

MALICIOUS

Office (OLE) / .XLS

110.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: d14185b59ad9d69f08574eb6d332360c SHA-1: 4ef20704cfe855d18bcc4c053f132133d82b0ded SHA-256: f6079cde5ac52325578ee54cb2d3353f35ff3a727e453097656812864fb83260
80 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File T1071.001 Web Protocols

The file is an Excel 4.0 (XLM) macro-enabled spreadsheet. A heuristic firing indicates the presence of an Auto_Open macro that uses dangerous functions, specifically the RUN function, which is often used to execute downloaded payloads. The document body contains text that appears to be a lure to enable macros or editing. The embedded URL `http://bartstoppel.com/rqfardzsgihu/555555555.png` is likely the source of the payload. The XLM macro likely uses functions like `URLDownloadToFileA` to fetch the payload and `CreateDirectoryA` and `exe` to prepare and execute it.

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.
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://bartstoppel.com/rqfardzsgihu/555555555.png�
    • http://bartstoppel.com/rqfardzsgihu/555555555.png

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
2ae78684fbae61c5ba58bf278920340a68f1c332376f4df6517f78d1e3d8c92e		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 4731 bytes

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