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

Static analysis result for SHA-256 efe3acc518a995cb…

MALICIOUS

Office (OLE) / .XLSX

332.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 18287cfd23a55417e34553b144c5bd6a SHA-1: 854d1fe0735522f025e3b0708c25f80370ece2b9 SHA-256: efe3acc518a995cba5fb43c53e7fa896b8153fae2babf3e05bd8a64f0b5dea9a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1059.001 PowerShell T1204.002 Malicious File

The file contains Excel 4.0 macros, specifically triggering the 'OLE_XLM_AUTOOPEN' and 'OLE_XLM_DANGEROUS_FN' heuristics, indicating the presence of auto-executing XLM macros. The 'SC_STR_SHELLEXEC' heuristic firing suggests the use of the ShellExecute API, likely to launch a payload. The embedded URL 'https://19racks.com.br/ds/151120.gif' is highly suspicious and is likely the source of the payload. The ClamAV detection further confirms the malicious nature of the file.

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 https://19racks.com.br/ds/151120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
4d5531650e0faf8764ddd7b14e6947143c32308cbf699d36f8845764b3b4560a		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 5603 bytes

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