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

Static analysis result for SHA-256 ca8eb99a076724da…

MALICIOUS

Office (OLE) / .XLS

86.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2021-02-26
MD5: 470dbcc997fcb300551dda043efd2dc4 SHA-1: fca1a7be23ef1a4fdffca67da25ba7ad4c409c24 SHA-256: ca8eb99a076724da6f9c67d3bdaf53abbf0762930472f02d8f3e8e8224b88eb0
102 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File

The sample is an Excel 4.0 (XLM) macro sheet, indicated by the OLE_XLM_AUTOOPEN heuristic. The document body contains text that appears to be an attempt to trick the user into enabling macros or editing, as suggested by the SE_ENABLE_LURE heuristic. The embedded URL points to a suspicious domain, likely serving as a download source for a second-stage payload.

Heuristics 4

  • URL reconstructed from XLM cell array (1 URL) 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), across individual numeric cells (one ASCII charcode per cell), or split across multi-char fragment cells a download formula concatenates by reference (=A1&A2&… / CONCATENATE(...)). 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, LABELSST/RK/NUMBER cells, and FORMULA cell-reference concatenation in token order.
  • 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 http://toqku26hwpu02shuroh.com/fera/frid.gif� Referenced by macro
    • http://toqku26hwpu02shuroh.com/fera/frid.gifReferenced by macro

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