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

Static analysis result for SHA-256 b77103c5ecc10c5f…

MALICIOUS

Office (OLE) / .XLS

328.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 88d6a9151bf7b0493734074c784261e9 SHA-1: 1702b43f8f0f181b8469075d7c1c4be886881413 SHA-256: b77103c5ecc10c5f06689ae16ad8b21bcb7d35bfb6ec55edeba9d5781bc7dc02
120 Risk Score

Malware Insights

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

The critical ClamAV heuristic and the high-severity OLE_XLM_DANGEROUS_FN firing indicate the presence of malicious Excel 4.0 macros. The embedded URL, also present in the document body, is likely used to download and execute a second-stage payload. The macro sheet marker and the use of dangerous formula APIs further support this assessment.

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://behendige-boxers.nl/ds/0902.gif�
    • https://behendige-boxers.nl/ds/0902.gif

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
fe3d0c9f5ea1e2c3ec2903a85e7edd2e4db105d518a1469e71277e913958c44d		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 4168 bytes

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