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

Static analysis result for SHA-256 e3a09bc0c5476764…

MALICIOUS

Office (OLE) / .XLSX

106.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-05-31
MD5: d5def153d07cd1a4e255521a4df38bb7 SHA-1: 57b041033ebf2e0938b6cfc3f98a077f86b4914f SHA-256: e3a09bc0c5476764c150997a328effc452afe448b1fb80437b07178292fbaea2
120 Risk Score

Malware Insights

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

The sample contains Excel 4.0 macros with an Auto_Open entry, indicating it will execute automatically when the workbook is opened. It also contains a lure to enable macros by impersonating DocuSign. The extracted URLs are likely used to download a second-stage payload. The presence of 'rundll32' and 'DllRegisterServer' suggests the execution of malicious code.

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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