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

Static analysis result for SHA-256 f8303353b61cd6ec…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: b5866b19458c7fcb12b77d088d87aa7a SHA-1: 9934ee59f0e6065f633e572d3e8cd65d9b7f78f0 SHA-256: f8303353b61cd6ec50ec19e3ffed9446f058a102674f30e51d4bf4e9b995deb1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059.004 Scripting: Visual Basic

The file is an Excel 4.0 (XLM) macro-enabled document. The presence of an Auto_Open macro and a reference to ShellExecute API indicate that the document is designed to execute arbitrary code upon opening. The document body text and the ClamAV detection name suggest a lure related to DocuSign, likely to trick users into enabling macros. The embedded URLs are likely used to download a second-stage payload.

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 https://avra.dtmh.gr/ds/231120.gif
    • https://avra.dtmh.gr/ds/231120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
8b13557c7c753c9d978b32b1134fab6c924344fc591b06bd0cf8f75d5ca380b6		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6060 bytes

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