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

Static analysis result for SHA-256 e566001a81610246…

MALICIOUS

Office (OLE) / .XLSX

332.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 57dd7b48854c763aad7027b1cd60b3d0 SHA-1: 4f9a8bda50e9f3e1ae238f3611e009ee26f36ea3 SHA-256: e566001a816102461747bc219b479c4cefba854cb3fb47caf56c85bfadf318c0
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) with an Auto_Open function, which is a known technique for executing malicious code upon opening. The heuristic firings indicate the use of ShellExecute API and dangerous XLM functions, suggesting the macro is designed to download and execute a payload. The embedded URL is likely the source for this payload. The ClamAV detection name 'Doc.Downloader.Docusign0521-9864805-0' further supports the downloader functionality.

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://esp.adnan.dev.hostingshouse.com/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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