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

Static analysis result for SHA-256 1a38328fe4aeb13b…

MALICIOUS

Office (OLE) / .XLS

243.0 KB Created: 2021-10-27 10:31:49 Authoring application: Microsoft Excel
MD5: 2fd5f4e71d6469dd363c02711aa55978 SHA-1: 2fc1cb52bae515cb2e88f687c804fc654f61bebb SHA-256: 1a38328fe4aeb13be8c9adad12f22c2864bcd745d1c72c1190001e3962b57958
82 Risk Score

Malware Insights

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

The critical heuristic OLE_XLM_CELL_ARRAY_URL indicates the presence of Excel 4.0 macros that reconstruct and use URLs. The script analysis confirms this, showing the macro attempts to execute 'wm

Heuristics 3

  • URL reconstructed from XLM cell array (3 URLs) 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.
  • 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://cdn.discordapp.com/attachments/911255825308348439/917344555379085402/efrXXwhatsupmotherfuckers.bin
    • https://cdn.discordapp.com/attachments/911255825308348439/917344562354221086/bfugrKhVwhatsupmotherfuckers.bin
    • https://cdn.discordapp.com/attachments/911255825308348439/917344568125562890/GuJPZwmNijUwhatsupmotherfuckers.bin

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
1e34f82416e5617be8b9560e1858c722430ef78ad880fa25cc00bc21e68df1b1		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 167799 bytes

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