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

Static analysis result for SHA-256 8dadcfa6f2fac387…

MALICIOUS

Office (OOXML) / .XLSX

607.3 KB Created: 2019-11-27 09:20:57 UTC Authoring application: Microsoft Excel 12.0000
MD5: d952d9855378d75c3fa00cc4d233de34 SHA-1: f45056d309a1b84893df34521263cd73db56b8e2 SHA-256: 8dadcfa6f2fac387316286a07abc3ad6ffb40a19c3d2136447880a81837de976
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking

The analysis identified an embedded OLE object within an Equation Editor object, a common technique for exploiting vulnerabilities to deliver malicious payloads. The anomaly in the Ole10Native stream size suggests the object is not a standard Equation Editor but rather a carrier for a secondary payload. No document body text was available for further contextual analysis.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/CgO.RQwIvcj contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
c3cd06f1cd923b81f43c690507d9bd1e36b62ea74941008daf4d16526ff0b8a9		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/CgO.RQwIvcj 898048 bytes
ooxml_oleobject_00_ole10native_00.bin
c3bce1a062929ab551cf83546a703c71ac595958ea3e93f4f8b0b084a82ade50		 ole-package OOXML xl/embeddings/CgO.RQwIvcj Ole10Native stream: Ole10naTIvE 888545 bytes

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