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

Static analysis result for SHA-256 11d1089ff7bc06a5…

MALICIOUS

Office (OLE) / .XLS

343.5 KB Created: 2020-07-10 10:41:45 Authoring application: Microsoft Excel
MD5: d5d3d09bb20dee9f946511bc6c6c976a SHA-1: f2e60a76b33e508b4cc6ca264681b4a883c191ff SHA-256: 11d1089ff7bc06a5df7abaf32cea4f0fd118123f7a33f8f3a9082f3b70689e67
182 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open function that utilizes dangerous formula APIs like RUN. This indicates an attempt to automatically execute code upon opening the document, a common tactic for downloading and executing further malicious content. The presence of a lure to enable macros further supports this malicious intent.

Heuristics 6

  • 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.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • 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
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://ns.adobe.com/xap/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
8eb1e14705ae382fd038fd2205619c3d5f6618842bbad274adf47831fae3d487		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 95138 bytes

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