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

Static analysis result for SHA-256 7034e21128da9ce5…

MALICIOUS

Office (OLE) / .XLS

63.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 9423ee9775707d51960e0eac95b3f6cc SHA-1: debc0defc997fde77a2f0cee9b3b1fcbed54ea91 SHA-256: 7034e21128da9ce58c2d5249d3fd73dd766cf90437fa52f79faa50098f359634
60 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The sample is an Excel 4.0 (XLM) macro sheet, identified by the OLE_XLM_AUTOOPEN heuristic. It contains a lure to enable macros by impersonating a document signing service, a common tactic for malware droppers. The document body contains URLs that likely host the second-stage payload, and a reference to a file named MORI.BAST, suggesting a download and execution chain.

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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