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

Static analysis result for SHA-256 91fc91c3e12a31db…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: f5f1262e954e4c73a9a3ba93506ba8af SHA-1: b91cc842fce5f393cdb2a649dae7da90efee715b SHA-256: 91fc91c3e12a31db2492000f434c1ca42c9255774e7b180f7be38ce7792b3b7e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File 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 firings for ShellExecute and XLM Auto_Open, combined with the embedded URL, suggest the macro's intent is to fetch and execute a secondary payload. The ClamAV detection further supports its malicious nature as a downloader.

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://panzr.tech/ds/231120.gif
    • http://panzr.tech/ds/231120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
c8b1e7a8344e098ddc3906ba00141dccfa02d07406793ff05618684390276899		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6057 bytes

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