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

Static analysis result for SHA-256 11cc7cf74925363c…

MALICIOUS

Office (OLE) / .XLSX

58.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 7ad74ac482b42547cc092b02a9f60ea9 SHA-1: e75d31bcebeb3f1e2365a6d4101ef131eb4684e7 SHA-256: 11cc7cf74925363c9be22fcbbad070dfc9ef732055cfcc91f4d48aad9b933061
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The sample is an Excel file containing Excel 4.0 macros, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN heuristics. The macros are designed to execute automatically upon opening, as evidenced by the Auto_Open defined name. The document body and macro sheet names suggest a lure related to DocuSign, aiming to trick the user into enabling macros. The macro uses the RUN function to execute a downloaded payload from the URL www.psicheaurora.it/fanta/download.php, and also references 'ndll32' and 'DllRegisterServer', suggesting it may attempt to register a DLL.

Heuristics 4

  • 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.
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
f4049687de69fbae7a0009d349264e905f03c629c5b7f7eb1990c6538d126bea		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2738 bytes

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