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

Static analysis result for SHA-256 f004441601d2d7f8…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 0787c8604d7fb0e71ded6531b590e624 SHA-1: 434ec995c18289e26ba00b85d84b3956e346de5f SHA-256: f004441601d2d7f8a76f4269544d4815165cdc1051a2e2cb76e2604d80951116
160 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open function that utilizes dangerous formula APIs like RUN and CALL. This indicates the macro is designed to execute arbitrary code. The presence of ShellExecute API calls further supports the intention to launch external processes. The embedded URL likely serves as a distribution point for a secondary payload. The ClamAV detection name 'Doc.Downloader.Docusign0521-9864805-0' suggests a 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://justhrng.com/ds/231120.gif
    • https://justhrng.com/ds/231120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
9badecf38f0cfde72dfd647ab7be67f2ec36dad7a41b3ad4474856d47fd4391b		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6060 bytes

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