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

Static analysis result for SHA-256 d5fce3008efb1771…

MALICIOUS

Office (OLE) / .XLSX

332.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: b3239cac8166a06d7fd56fdd68d23c56 SHA-1: a5cd2e4474579077574d3c00510f273c650f7b11 SHA-256: d5fce3008efb1771b92d80908bee6f152735a08429ea3a9d47ab2ec9b05fc47d
160 Risk Score

Malware Insights

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

The file contains an Excel 4.0 macro (XLM) that utilizes the ShellExecute API. This macro is designed to execute a command, indicated by the embedded URL http://cloud.c-tes.gr/ds/151120.gif, which is likely a lure for downloading and executing a secondary payload. The presence of XLM macros and the use of ShellExecute are strong indicators of a downloader or droppper malware.

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 http://cloud.c-tes.gr/ds/151120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
89aad7b8576d8f84c1934acd2fc0826a9bcea7c600ce1ac7e8579bafe1fef843		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 5602 bytes

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