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

Static analysis result for SHA-256 9a463718c6131636…

MALICIOUS

Office (OLE) / .XLSX

329.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: f884d7604b98d43d0b7a97dfeb515771 SHA-1: 93ea29627ea16b0df073fd5d8128e4f61f7dee05 SHA-256: 9a463718c6131636b8fe08668a4e3024b9b152897efa7254673a08ebbed85670
160 Risk Score

Malware Insights

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

The file contains an Excel 4.0 (XLM) macro that uses the ShellExecute API, indicating it is designed to download and execute a second-stage payload. The embedded URL `https://nomzoo.ml/ds/161120.gif` is likely the source of this payload. The ClamAV detection name 'Doc.Downloader.Docusign0521-9864805-0' further supports the downloader functionality and the DocuSign lure.

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://nomzoo.ml/ds/161120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
b74fbb14c9dd0283fe5b35630158622cf58bbddcd03d161d30bf64d1f40271a4		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 7889 bytes

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