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

Static analysis result for SHA-256 9b3c4ac6517c998b…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 33155d9b298c380f25fd3a9b9733cd0e SHA-1: 909c18f3bbf36ea2739081d546549560451056c2 SHA-256: 9b3c4ac6517c998b72b13678becdeeb74562a4005fcc811d22cf91940046acbe
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059.004 Scripting - Macro T1105 Ingress Tool Transfer

The sample contains a critical ClamAV detection for Doc.Downloader.Docusign0521-9864805-0, indicating it is a downloader. The presence of Excel 4.0 macros, specifically an Auto_Open macro utilizing dangerous functions like ShellExecute, strongly suggests the intent to download and execute a second-stage payload from the embedded URLs. The document body text is minimal and does not provide further context beyond generic file-related terms.

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://binbios.com/ds/261120.gif
    • https://binbios.com/ds/261120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
db00faaaa5dfbd9a76904fe95aa20bad9a05f6214a6081cc43218c3c9509e31c		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6676 bytes

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