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

Static analysis result for SHA-256 8b85d753aa4aa56e…

MALICIOUS

Office (OLE) / .XLS

330.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 5252a1d2eb708c0e80145052643c031c SHA-1: b7576f1fd9b3809c7182e93828dea3633c27808a SHA-256: 8b85d753aa4aa56e937ac4507dd177eb5bb9f59d2999b12bd9ad750264cc1598
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059.001 PowerShell T1059.003 Windows Command Shell

The file contains Excel 4.0 macros, specifically an Auto_Open macro that utilizes dangerous functions like RUN and potentially others to execute arbitrary code. The presence of ShellExecute API calls further indicates the intent to launch external processes. The embedded URL likely serves as a distribution point for a second-stage payload, which is a common downloader tactic. The ClamAV detection name 'Doc.Downloader.Docusign0521-9864805-0' suggests a phishing or social engineering lure related to DocuSign.

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://rlink011.pw/ds/231120.gif

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
c461ade38d400d4a423d855884def8ceb5c41198f9e35b0fb284854a9f7c58df		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6059 bytes

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