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

Static analysis result for SHA-256 64da58e86788acd7…

MALICIOUS

Office (OLE) / .XLS

434.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 1209b5c14ca427ee2feb13f7fb54f458 SHA-1: 8fe4bc5c7ceae5abbe399f710f49f184d7fd0289 SHA-256: 64da58e86788acd7265b37a9e0fca0cba17a36a699695fbe7b48c042b954ffda
262 Risk Score

Malware Insights

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

The sample contains Excel 4.0 macros and VBA macros, with a Workbook_Open event designed to execute malicious code. It leverages the URLDownloadToFile API to download a payload from http://jabba.fun/crun20.gif. The document body contains a lure about car model updates, which is unrelated to the malicious functionality.

Heuristics 8

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • URL reconstructed from XLM cell array (1 URL) critical OLE_XLM_CELL_ARRAY_URL
    Excel 4.0 macro sheet stages its payload URL across the BIFF8 Shared String Table (one quoted-char SST entry concatenated with & at runtime) or across individual numeric cells (one ASCII charcode per cell). The reconstructed URL is invisible to literal-bytes URL extraction because it is never contiguous in the workbook stream. URLs were recovered by walking the BIFF8 record stream and decoding SST entries plus LABELSST/RK/NUMBER cells.
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • 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://jabba.fun/crun20.gif
    • http://jabba.fun/crun20.gif�
    • http://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
11bfa8d92387ecf328faef5f79f106108f6f27d19809be585d9bf0b7c16ba3b5		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 8558 bytes
macros.bas
37db320dd2f08ca151ba0eed72f38995b07629a8d58f18c64d048ecb72b105a8		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1282 bytes

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