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

Static analysis result for SHA-256 b6b962026d8f7aaf…

MALICIOUS

Office (OLE) / .XLS

332.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: c0d4cf01eedeefd01f12cd63b6ae031f SHA-1: 6631848676b428dec19b531994ef49d232320b67 SHA-256: b6b962026d8f7aaf4228dc4b5725a0f2b933b009ce6a8226e7352faa48a58c99
100 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled spreadsheet. Heuristics indicate the presence of an Auto_Open macro that uses dangerous functions, specifically referencing ShellExecute and RUN. This macro likely downloads and executes a second-stage payload from the embedded URL. The document body contains generic sheet names, offering no specific lure.

Heuristics 4

  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • 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 https://birdexim.com/ds/231120.gif

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
b9e922997ab1008b6d5ca8df5e57db733535c15f4d8d4ecbbf5827b941f024c9		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6069 bytes

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