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

Static analysis result for SHA-256 fd687a06ee886291…

MALICIOUS

Office (OLE) / .XLSX

106.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-05-31
MD5: 5132d4780cfbb07b393ba8e57856230c SHA-1: c2bba91f34e8c0a76126cf5368cbd4ad6a8f4849 SHA-256: fd687a06ee8862919bffe1aff4f2da4d130a208558a7f60250c33d6f0ea1c541
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample contains Excel 4.0 (XLM) macros with an Auto_Open entry, indicating automatic execution upon opening. It also includes a lure to enable macros, impersonating DocuSign to bypass security. The extracted URLs and the 'rundll32.exe DllRegisterServer' command suggest the macro is designed to download and execute a second-stage payload.

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
404f0e01d629b2f4d86e1affb27c10c9f07baccb002a01d7ecaf0166ee6b100f		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 3765 bytes

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