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

Static analysis result for SHA-256 e7dd11be29cee224…

MALICIOUS

Office (OLE) / .XLSX

143.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 4b03995f57bea268f8b01a8ce572a87e SHA-1: 2980dd17ff7c2522280e4fc67c891ff7f2fcbd83 SHA-256: e7dd11be29cee224bd06528c5a85f36fcb634946460cff8bbe370491cbb2d367
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.005 PowerShell

The sample contains Excel 4.0 macros with an Auto_Open entry, indicating automatic execution upon opening. It also employs a lure to trick the user into enabling macros by impersonating DocuSign. The embedded URLs are likely used to download and execute a second-stage payload. The specific macro content is truncated, preventing a more detailed analysis of its execution flow.

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
fba4f4c211ae7dcd3bae1ed876ae699b787bb4cd9f688ad371b99d6235090299		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 4464 bytes

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