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

Static analysis result for SHA-256 648b28d16467c541…

MALICIOUS

Office (OLE) / .XLS

367.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 80f6f7cd0be7baf53aa084d3027a9df8 SHA-1: 0ea081442f6064fbc91a7c86c9a77854d3a2d18a SHA-256: 648b28d16467c541fa91d18086f4d4482c99c06e12266d4d751cabffdd703eab
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample is an Excel 4.0 (XLM) macro-enabled spreadsheet that contains an Auto_Open macro. The macro attempts to download a payload from one of two provided URLs. The document body contains obfuscated strings that appear to be part of the download or execution logic, including the reconstructed URLs. The presence of an Auto_Open macro and the lure to enable macros indicate a malicious intent to execute a second-stage payload.

Heuristics 4

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://silvertoncc.com/ys1Btp80hx/th.html
    • https://christleadersworld.com/1TaIPHnbwbNV/th.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
740337535414e50f998f7a71055f9de0e2208abc42faca490883ba1d9c48deb1		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 8349 bytes

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