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

Static analysis result for SHA-256 4d81a84f5e8f3603…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 353b1cb475ff2b74de0677b1d7dac126 SHA-1: 71cba684acf7452a20ba8c0bb4e642f500d53b85 SHA-256: 4d81a84f5e8f3603c2523193a04b0f65d11a2ad7f4d6a96402166d65f70c26cb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059.004 Shell Script

The file contains an Excel 4.0 macro (XLM) with an Auto_Open function, which is a known technique for executing malicious code upon opening the spreadsheet. The macro utilizes ShellExecute, indicating an attempt to run external commands or download additional content. The embedded URL likely serves as the distribution point for a second-stage payload. 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 https://feromon.shop/ds/231120.gif
    • https://feromon.shop/ds/231120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
367ec1ce7aaed8f0977647fda6a625a5496cb60a2906548fc328342f8d2ce8db		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6060 bytes

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