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

Static analysis result for SHA-256 70e52964315c504c…

MALICIOUS

Office (OLE) / .XLS

50.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 61d6cfd2d77f83befe17f6ece7c5e5c5 SHA-1: 5d66871911bd80b3277a7911e94e7f6268d293ed SHA-256: 70e52964315c504c4d4af775f79e53e45d81b393aa9b8e9a3c5d56609586aaa7
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample contains Excel 4.0 (XLM) macros with an Auto_Open entry, indicating an attempt to automatically execute code upon opening. The presence of a 'Macro/content-enable lure' heuristic suggests the document prompts the user to enable macros. The XLM macro uses dangerous formula APIs like RUN, likely to download and execute a second-stage payload from the embedded URLs.

Heuristics 5

  • 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.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • 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://www.crl-lhk.eus/bbvnoti/D�
    • http://www.crl-lhk.eus/bbvnoti/530340.png
    • http://www.crl-lhk.eus/bbvnoti/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
8b76d898c0540dcd58b68b856046c00a958a3cc7f83b44428b17c7bc114eeae4		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 3515 bytes

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