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

Static analysis result for SHA-256 148615094f84f11d…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 0f539df4f43aafb9c0b8a1ad776b5a35 SHA-1: 3578583887d289227af59dcee11ffd98f4f11fd4 SHA-256: 148615094f84f11d2c76a5ba6a6963b35b112c00888e84896630c7789d640ed7
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an Excel 4.0 macro-enabled workbook that contains an Auto_Open macro. This macro is configured to execute a CALL to 'kernel32.dll' with the function 'CreateA', which is a known technique for executing arbitrary code. The macro also references a URL, 'https://feromon.shop/ds/231120.gif', likely to download a secondary payload. The presence of the Auto_Open macro and the call to ShellExecute API strongly indicate malicious intent.

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://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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