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

Static analysis result for SHA-256 2cf291ca376a58d5…

MALICIOUS

Office (OLE) / .XLSX

261.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 73690262256f3a4872aaadb37acac4ed SHA-1: cd4327807142a8815c3a13a46ddb7abd8f23b32f SHA-256: 2cf291ca376a58d5ed057798b78331d28e1b16efcf193181ed0f85ecb05dac76
120 Risk Score

Malware Insights

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

The sample is an Excel 4.0 macro-enabled workbook that impersonates DocuSign to trick users into enabling macros. The embedded Excel 4.0 macro sheet contains an Auto_Open macro, which is a common technique for executing malicious code upon opening the document. The macro likely attempts to download and execute a second-stage payload from the URL http://..\sdbybsd.fds. The presence of the Auto_Open defined name and the macro-sheet BOF marker strongly indicate malicious intent.

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.
  • 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
  • Document signing service impersonation lure medium SE_DOCUSIGN_LURE
    Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
1cce783a487c585d0f0d553a6dcc92b7a1cc8611def516623538f51ccff16f05		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 4427 bytes

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