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

Static analysis result for SHA-256 601fc1c2583f234a…

MALICIOUS

Office (OLE) / .XLSX

209.5 KB Created: 2021-10-27 10:31:49 Authoring application: Microsoft Excel
MD5: 3b1b0bc447de4a74e2d637d3b8244763 SHA-1: 6bb973d8b5f4726482c2b53aaecc5a21f339a777 SHA-256: 601fc1c2583f234a213022b8c4ea5ec5fda60ff7d0bee939ca425ac89787892a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer

The critical heuristic OLE_XLM_CELL_ARRAY_URL indicates the presence of Excel 4.0 macros that reconstruct and use URLs. The macro script contains calls to FOPEN and EXEC, suggesting it attempts to download and execute a file, likely a VBScript given the reconstructed path C:\ProgramData\DaSOQRSQCRNDd.vbs. The three extracted URLs are the most likely sources for this payload.

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
025c0e20bdd8b4e69229e7c975dde0d62ae96af6bec1dadd2e50e9a29e3fe323		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2240 bytes

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