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

Static analysis result for SHA-256 5be8f0cd17a1cc09…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 22d3631e2429c84faa4b65517b1819c4 SHA-1: 7afdb04a1f82d4120204ea2726a6d48eec5ecea7 SHA-256: 5be8f0cd17a1cc09576cfdec1f5116f05b9ec7070ea8eaff045003174af4c8a9
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros that are configured to automatically execute upon opening. These macros utilize the RUN function and call dangerous API functions such as 'ShellExecute' to download a payload from the URL http://sadgad.ru/ds/231120.gif. The ClamAV detection 'Doc.Downloader.Docusign0521-9864805-0' further supports its nature as a downloader.

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 http://sadgad.ru/ds/231120.gif

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
3bec9e172ccd232a06c19125f84a780ce4976b1b3bed592580b4a95a301f6034		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6294 bytes

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