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

Static analysis result for SHA-256 36f37ae5d4b50030…

MALICIOUS

Office (OLE) / .XLS

212.5 KB Created: 2021-10-27 10:31:49 Authoring application: Microsoft Excel
MD5: cac10b5bb91b769e94549a44336963d1 SHA-1: 32c2e31c9f0c5448ce4b9f1bba0eb12780e1347d SHA-256: 36f37ae5d4b50030cb186ed6ff3b300cfc40d8db793c1a6b50af7ee0f6c4a0eb
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 designed to reconstruct a file path. The macro code explicitly constructs the string 'C:\programData\kGbSADN' using concatenation and character codes, which is likely intended to be used for saving or executing a downloaded payload. The presence of this reconstructed path suggests a downloader or droppper functionality, aiming to fetch and run further malicious content.

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/911255825308348439/917344562354221086/bfugrKhVwhatsupmotherfuckers.bin
    • https://cdn.discordapp.com/attachments/911255825308348439/917344555379085402/efrXXwhatsupmotherfuckers.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
b349973aff5fa3c7181351ce91b1763b55b870b1efef364dd40bf2d0d2d83e4b		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 167220 bytes

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