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

Static analysis result for SHA-256 a4e006e1e42223f6…

MALICIOUS

Office (OLE) / .XLSX

235.0 KB Created: 2021-10-27 10:31:49 Authoring application: Microsoft Excel
MD5: 89da7c34dc93eda18d3c6c6bbac62caf SHA-1: dd52e1173fe30cba2c2c4c7bb929f6d1ff704738 SHA-256: a4e006e1e42223f696e27a50307aa424ea378a6eb2eb0ac20d41a21d9ebcf009
82 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample contains Excel 4.0 macros, which are used to execute a VBScript payload. The script attempts to create a file at 'C:\ProgramData\lDDy\nXVFiSOimnZ.vbs' and then execute it. The embedded URLs were flagged as benign, but the macro's intent to download and execute a secondary payload is clear. The macro also contains a string concatenation to construct the path 'C:\ProgramData\lDDy\nXVFiSOimnZ.vbs'.

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/911255825308348439/917344568125562890/GuJPZwmNijUwhatsupmotherfuckers.bin
    • https://cdn.discordapp.com/attachments/911255825308348439/917344555379085402/efrXXwhatsupmotherfuckers.bin
    • https://cdn.discordapp.com/attachments/911255825308348439/917344562354221086/bfugrKhVwhatsupmotherfuckers.bin

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
06103998ca1dbc7741e2e10dfb7a7a54ce879c3abd36c10ba12b23f9697b2266		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 165968 bytes

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