Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 50cf59e72ab432c2…

MALICIOUS

Office (OLE)

318.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: fe4a7545d85e0bc0b304234a4e8b1ffd SHA-1: 690a06f72a3b021505f29d29e1487072da948937 SHA-256: 50cf59e72ab432c27b2422a47e45ba164292c66f3d39ea09401dcb9ed04a7cbf
120 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro sheet (XLM) that contains an Auto_Open macro. This macro is designed to execute dangerous functions, specifically the RUN function, which is used to download and execute a payload from the URL https://support.nuvemit.com/ds/1502.gif. The ClamAV detection 'Doc.Downloader.Docusign0521-9864805-0' further supports its role as a downloader.

Heuristics 4

  • 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 https://support.nuvemit.com/ds/1502.gif�
    • https://support.nuvemit.com/ds/1502.gif

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
fefece9127c35e2a9dbe91bfa66ed0ec5923eeac8572c5b22807ea99e41abfae		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 4374 bytes

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