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

Static analysis result for SHA-256 0e9e642dfd183ad0…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: fd9f2bc9670406ff612ded04fa930829 SHA-1: d258d050e89e92b5397928094d86176f44f0ad56 SHA-256: 0e9e642dfd183ad052fa34917855c0f5614c3c58a4d44d0203e85fc42b460e4a
242 Risk Score

Malware Insights

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

This Excel 4.0 macro-enabled spreadsheet contains an Auto_Open macro that utilizes the RUN function to execute code. The macro also contains a CALL function that appears to construct a command to download a file from the URL 'https://seligue.net/ds/231120.gif'. This indicates the file is designed to download and execute a secondary payload.

Heuristics 6

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical 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.
  • 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
  • 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://seligue.net/ds/231120.gif
    • https://seligue.net/ds/231120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
7d52b160b251e749d24dcaa8a7221d3fa1a2d506bf23ecf06e056242a80d0dfe		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6297 bytes

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