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

Static analysis result for SHA-256 4ff9ac57c1c0f0ec…

MALICIOUS

Office (OLE) / .XLS

62.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 633a545276e88c1fc69fa22de68f2648 SHA-1: 9d6c75287c568ef1ba37ef7829d066b6284a2cf9 SHA-256: 4ff9ac57c1c0f0ece9d1dbd50f3c3c2ac26817a5b7cabe03e00b460d642e4b70
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.004 Unix Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is an Excel 4.0 (XLM) spreadsheet containing both XLM and VBA macros. The Workbook_Open macro and XLM Auto_Open function are present, indicating execution upon opening. Heuristics indicate the use of ShellExecute and URLDownloadToFile APIs, suggesting the downloaded content will be executed. The document body contains an embedded URL, which is likely the source for the second-stage payload. The presence of an enable-lure heuristic further supports the malicious intent.

Heuristics 8

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • 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.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • 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.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • 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://blog.vokasidev.com/crun20.gif�
    • http://blog.vokasidev.com/crun20.gif

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
d4222e1ad83b892546402a65bce1342319760d5f0e17d0c73ae5f07e792beb86		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 9447 bytes
macros.bas
c29faf2da8b6b84c63880f8f3ff09f138acdaa94ad9406cab75b546ae0e54428		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 979 bytes

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