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

Static analysis result for SHA-256 27110ea4841bd262…

MALICIOUS

Office (OLE) / .XLSX

261.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-09-22
MD5: 33703dc3e11f03e965b17ffc36411e2f SHA-1: 6549efbe8924e208e61c33fd0458acafd72dcf83 SHA-256: 27110ea4841bd262adf28a022402371a860b0430bc1d133dd6aefacd8322e919
120 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1059 Command and Scripting Interpreter T1059.005 Command and Scripting Interpreter: Visual Basic

The sample contains Excel 4.0 macros with an Auto_Open entry, indicating automatic execution upon opening. It also includes a lure to enable macros, impersonating DocuSign to deceive the user. The embedded URL 'http://..\sdbybsd.fds' is likely used to download and execute a secondary payload. The presence of an Auto_Open macro and the DocuSign lure strongly suggest a malicious intent to compromise the user's system.

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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