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

Static analysis result for SHA-256 8683fce1b183e448…

MALICIOUS

Office (OLE) / .XLS

330.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 4b1ce537f839cc2d1dc2a7cbcef7a279 SHA-1: fa0cb53c5efc2d101d9f093cb14a50eb9346259c SHA-256: 8683fce1b183e448f3ce6eede7245dfc290c12fe6012cfe6340639dfbdc326a5
160 Risk Score

Malware Insights

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

The file 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, which is often employed to download and execute additional payloads. The embedded URL is likely the source for this secondary stage. 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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