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

Static analysis result for SHA-256 614f3f54abffeaf1…

MALICIOUS

Office (OLE) / .XLS

229.0 KB Created: 2021-10-27 10:31:49 Authoring application: Microsoft Excel
MD5: 7d7cbd8e78186a4f69569b3ea0b2b9b5 SHA-1: 9e2b54a0cb514299730e41f4d0e4b2872fe00625 SHA-256: 614f3f54abffeaf195edde78e7e2403c0a665387cfa41c2200e5cecae91d7aed
82 Risk Score

Malware Insights

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

The sample contains Excel 4.0 (XLM) macros, identified by the OLE_XLM_AUTOOPEN heuristic. These macros are designed to download and execute a second-stage payload. The script attempts to construct the path 'C:\ProgramData\qEFhqw.vbs' and uses the EXEC function, indicating it will attempt to run the downloaded content. The URLs provided are highly suspicious and likely host the 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
1c89348e152959540b5d45afd45549e3e0c2e815b1af7099d3e35b03d13f78d1		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2285 bytes

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