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

Static analysis result for SHA-256 ca46ddd04d61c0e3…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 21ecdfbddbd1eb9898ffd1e20ed14abd SHA-1: becf0987a99d29e93ee4e5e323fc0b43cec9d8e5 SHA-256: ca46ddd04d61c0e3a62a38103c413834689825f8a508cd39eae6011592212ce6
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 the Auto_Open function utilizing dangerous APIs like RUN, strongly indicates a downloader. The heuristic firings, including SC_STR_SHELLEXEC and OLE_XLM_DANGEROUS_FN, confirm the use of macro execution to run external commands. The embedded URL likely serves as the source for the second-stage payload. The ClamAV detection further supports the malicious nature of the file.

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://kenas888.com/ds/231120.gif
    • https://kenas888.com/ds/231120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
6dd2ce04afad0a05495adb4f6301aeb41dcc78e9673b9399eb28871054a28e1a		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6060 bytes

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