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

Static analysis result for SHA-256 dad78a154fb02eff…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: bcbb62490e148e928a7a1816279d9b50 SHA-1: 39bb331d3fc8c1b447bc1800937cc3e76dd95660 SHA-256: dad78a154fb02effe710213c793dcb8e12a7dea40b84f248f33c0b044ffb7538
160 Risk Score

Malware Insights

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

This XLS file contains Excel 4.0 macros, specifically an Auto_Open macro that utilizes dangerous functions like RUN and CALL. The heuristic firings indicate the use of ShellExecute and the presence of XLM macros, suggesting the file is designed to download and execute a secondary payload. The embedded URL points to a GIF file, which is likely a lure or a component of the downloader chain. 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 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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