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

Static analysis result for SHA-256 a0618866ff948412…

MALICIOUS

Office (OLE) / .XLS

330.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: e87fe4cdfe0271d41dfd2bb00bf30a46 SHA-1: 3050bbf2153adaf22dc4716514acc555ab90c0d5 SHA-256: a0618866ff948412f18efb3f3bb772b3ff8d6ac11c20b4f450ba12ed18149baf
160 Risk Score

Malware Insights

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

The sample contains Excel 4.0 macros, specifically an Auto_Open macro that utilizes dangerous functions like RUN and CALL. The heuristic firings indicate the use of ShellExecute API and the presence of XLM macros, suggesting the file is designed to download and execute a payload. The embedded URL is likely the source of this payload. The ClamAV detection name 'Doc.Downloader.Docusign0521-9864805-0' further supports the 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 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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