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

Static analysis result for SHA-256 0cbb3f7e2541ad28…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 4e9c00d7219b05a58d53043c19ec92b7 SHA-1: 56d683c5959f7cd1951dfb87048cf124f7df8c98 SHA-256: 0cbb3f7e2541ad282883d05ac1ef1eb88095e96da9568788bccbab7f8a5aa965
242 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros that are configured to automatically execute upon opening. These macros utilize the RUN function and CALL function to execute code, including a call to 'Ke32' and 'CryA', and attempt to download a payload from the URL https://seligue.net/ds/231120.gif. This indicates a downloader functionality.

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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