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

Static analysis result for SHA-256 1d8bdb45fc51ec26…

MALICIOUS

Office (OOXML) / .XLSX

14.8 KB Created: 1996-10-14 23:33:28 UTC Authoring application: Microsoft Excel 15.0300
MD5: 1aad934893852824a8cfa956d8b0f43d SHA-1: 0fa172368c0b1ed9570eb496f2dfac72a04f47ce SHA-256: 1d8bdb45fc51ec2617f0890144c339043e5997d60bc1c05d81a4d2d777e20125
120 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1059.005 Visual Basic

The file is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate this object is anomalous and exploits CVE-2018-0798. The document also contains a lure to enable editing, a common tactic for macro-based malware delivery. The embedded OLE object is the primary indicator of malicious intent, likely serving as a payload or exploit delivery mechanism.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oleObject1.bin contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY
    Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object
  • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
f5b968161c13d1fb253294b366879ab7135494d7687a970c8131f9a151203d3e		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
6c3dc11641f588935a70f54bf4230870ed078c7cb32bb7983fd0eaefb118446d		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10NATivE 1791 bytes

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