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

Static analysis result for SHA-256 12c893ea281cfa4a…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 82bc49128c2f7df881c78d5179419c82 SHA-1: 2e91829c6155a39f544ebe6b013c7f1e0f92371e SHA-256: 12c893ea281cfa4ab8dd88798ce40e6de793368eb678a131ff3d7bd33738e7a2
242 Risk Score

Malware Insights

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

The sample contains Excel 4.0 macros that are configured to automatically execute upon opening. These macros utilize the RUN and CALL functions to execute concatenated strings, likely forming a command to download and execute a secondary payload from the URL https://bgms.co.in/ds/261120.gif. The use of ShellExecute API and the specific XLM functions indicate a downloader or dropper 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://bgms.co.in/ds/261120.gif
    • https://bgms.co.in/ds/261120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
e213645668ce9f5d68f4226afb5b9b5e6c2ad49807658d9b833212b471c7c00d		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6675 bytes

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