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

Static analysis result for SHA-256 ef7571fe1689e216…

MALICIOUS

Office (OLE) / .XLS

382.0 KB Created: 2020-02-09 19:04:57 Authoring application: Microsoft Excel
MD5: f6cb5fa1a5f739563e930f1ba76b2501 SHA-1: 3ad0289824159e89ab9af8a2282f0cb12c575571 SHA-256: ef7571fe1689e2166c75eecaf980aff539ad4dcf73e50adb11c2630602081850
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059.001 PowerShell T1059.003 Windows Command Shell T1059.004 JScript/VBScript

The file contains Excel 4.0 macros, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN heuristics. The SC_STR_URLDOWNLOAD heuristic and the embedded URL http://synergyctsfl.com/falcon.exe suggest that the macro is designed to download and execute a secondary payload. The ClamAV detection further confirms its malicious nature as a downloader.

Heuristics 5

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • ClamAV: Doc.Downloader.Docusign0521-9864805-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Docusign0521-9864805-0
  • 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://synergyctsfl.com/falcon.exe
    • http://the.earth.li/~sgtatham�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
ffd547baec70f839032a21de09aae6c553377c7f547ef50340c9ed91073f1ad2		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 54845 bytes

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