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

Static analysis result for SHA-256 490f0fa417b2fff4…

MALICIOUS

Office (OOXML) / .XLSX

638.7 KB Created: 2019-11-27 09:20:57 UTC Authoring application: Microsoft Excel 12.0000
MD5: e1ca58a6eaf8d4887add633a625d9141 SHA-1: 30b86d652955b651becb4d92e3a8c6627d029ba4 SHA-256: 490f0fa417b2fff4e5834aa49741bc79191652daa5b88ad0327ddb37216beb5c
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1559 Component Object Model Hijacking

The sample is an OOXML file containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size and entropy, strongly suggesting it is being used to exploit a vulnerability. This is a common delivery mechanism for Equation Editor exploits.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/VqyZWReYv.c1Wrba 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
95af44f796f0fd93111e14ce22a08575515a0a39823e5940ec0f22793756e795		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/VqyZWReYv.c1Wrba 864768 bytes
ooxml_oleobject_00_ole10native_00.bin
c4d57039a538bdaa134940815bd851f2683fb046769c6874352d1ed2c8510c05		 ole-package OOXML xl/embeddings/VqyZWReYv.c1Wrba Ole10Native stream: ole10natiVe 855337 bytes

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