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

Static analysis result for SHA-256 ecaba5d26b335860…

MALICIOUS

Office (OLE) / .XLSX

277.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 59c9f3469b577cd8c4846cdf4d5e6695 SHA-1: 4c7d119d29cbd08d0824c8794adf98b3d9151d2f SHA-256: ecaba5d26b33586004c7de1821495e231a7c357a222715e9df199d969e2e9c58
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 employs a lure to trick users into enabling macros by impersonating a document signing service, as suggested by SE_ENABLE_LURE and SE_DOCUSIGN_LURE. The document body contains obfuscated text that reconstructs to a URL and a DLL filename, likely for downloading a second-stage payload. The XLM macro itself is likely responsible for the download and execution.

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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