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

Static analysis result for SHA-256 51f39db92c86e751…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 5a2057ad0b061c497f5d68c5a85e82ee SHA-1: ab7a99f607f1e9c0bcb3ca9d31802c5f5476940e SHA-256: 51f39db92c86e751b8ed047e20e9d6906d8514f9561ffb582a51128841e4830c
160 Risk Score

Malware Insights

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

The presence of an Excel 4.0 macro sheet with an Auto_Open function, combined with a ShellExecute API reference, strongly indicates malicious intent. The macro is designed to execute a dangerous formula, likely to download and run a secondary payload from the provided URL. The ClamAV detection name 'Doc.Downloader.Docusign0521-9864805-0' further supports this, suggesting a downloader functionality.

Heuristics 5

  • ClamAV: Doc.Downloader.Docusign0521-9864805-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Docusign0521-9864805-0
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • XLM Auto_Open with dangerous formula APIs high 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.
  • 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://me48.ru/ds/231120.gif
    • http://me48.ru/ds/231120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
b1a92fcba2ebe2fa90d2bd7eccdde9a9cc031a83a8bf04784dc2cdcfbba2a01a		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6292 bytes

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