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

Static analysis result for SHA-256 6c0262cb0865aa4a…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: c20cf8569378d40321d2f4d5b948cbc7 SHA-1: 814b1558e21d160b8dbdb60047c32417f8a07830 SHA-256: 6c0262cb0865aa4aa79fb61b0e1c75b020cf6e033c907a8a2e0a5b1ef7b9d0f2
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

This Excel 4.0 macro-enabled workbook contains an Auto_Open macro that executes a series of commands. The macro is designed to download a payload from the URL https://justhrng.com/ds/231120.gif and likely execute it. The use of Excel 4.0 macros and the Auto_Open entry point strongly suggest a malicious document intended for initial compromise via spearphishing.

Heuristics 6

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical 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.
  • 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
  • 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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