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

Static analysis result for SHA-256 aeddf7aed1ce2c2e…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: a7a36f158122c65818ffe7eae288a5d9 SHA-1: 7225e770483c265589e1cbe0702f9115f63ea31a SHA-256: aeddf7aed1ce2c2e1f97ce04f6fbb24fb991075120763d7e04f4e9f1420560f7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059.001 PowerShell T1105 Ingress Tool Transfer

The presence of Excel 4.0 macros, specifically an Auto_Open function utilizing dangerous APIs like RUN, strongly indicates a downloader. The heuristic firing for ShellExecute further supports the execution of external code. The embedded URLs likely serve as the source for the second-stage payload. The ClamAV detection as 'Doc.Downloader.Docusign0521-9864805-0' reinforces 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 http://ski-travel.pl/ds/231120.gif
    • http://ski-travel.pl/ds/231120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
d0d7060848f9e43377c289847dba3120f97cf87e725bc4bc328c35415fe210f7		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6298 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.