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

Static analysis result for SHA-256 468cd4b5d89425cd…

MALICIOUS

Office (OLE) / .XLSX

277.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: c527325d4d0b51734637b5344a3df760 SHA-1: f71b0baa85537ec1709701f39e8e9fd95f9b3d62 SHA-256: 468cd4b5d89425cd29bb028696804ed339eb2c0c37b010b62442fbb5a8f778ba
60 Risk Score

Malware Insights

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

The sample contains an Excel 4.0 macro sheet and employs a lure to trick the user into enabling macros, impersonating a document signing service. The macro sheet contains obfuscated strings that reconstruct to a URL (http://akoneckotechnology.com/netmons.dll) and a DLL filename (.. etmons.dll), indicating the likely intent to download and execute a second-stage payload. The obfuscation and lure suggest a downloader or droppper.

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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