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

Static analysis result for SHA-256 ec24457be02971bd…

MALICIOUS

Office (OLE) / .XLSX

142.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-05-31
MD5: 4891311b2f51d4b175adee4aa1532209 SHA-1: ab50903f5d29a03c81328c312fb9defd988692aa SHA-256: ec24457be02971bda2f862de6628ac2d975b9e97827b06635e2107d409606656
120 Risk Score

Malware Insights

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

The sample contains Excel 4.0 macros with an Auto_Open entry, indicating automatic execution upon opening. The document body and heuristics suggest a lure impersonating DocuSign to prompt the user to enable macros. The embedded XLM macros likely download and execute a second-stage payload from the provided URLs.

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
fd395c0d5efe31bc3f4c13f428339dafef8132102e75fdb8cfce92015175af32		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2730 bytes

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