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

Static analysis result for SHA-256 43625f5a70932117…

MALICIOUS

Office (OLE) / .XLSX

104.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: ece42acdf780515543dfd26f000bc6e0 SHA-1: 38fe1aa818a049755c71435a2fe56b02716989df SHA-256: 43625f5a7093211741120faf4c4c82d9457e820f8e9c379748ce1dc8fe5fec7a
60 Risk Score

Malware Insights

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

The sample is an Excel file containing XLM macros, indicated by the OLE_XLM_AUTOOPEN heuristic. It uses a lure to trick the user into enabling macros, impersonating a document signing service like DocuSign. The extracted text suggests the macro will likely download and execute a second-stage payload from one of the provided URLs, using rundll32.exe with DllRegisterServer.

Heuristics 3

  • 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

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