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

Static analysis result for SHA-256 a380ebb3f7def690…

MALICIOUS

Office (OOXML) / .XLSX

8.6 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: 17cff4b8f00f1bbc5ca997c4cc473b3e SHA-1: 0437b11888c4a031f5804aa6ef8f3dc7e4c6f4c1 SHA-256: a380ebb3f7def69026ebd8ff72bb7a688bb55f5884915b2bd19c57c4975f6211
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious File T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The sample contains an embedded OLE object, specifically an Equation Editor object, which is known to be vulnerable to CVE-2018-0798. The anomalous native stream within this object strongly indicates exploitation of this vulnerability. This technique is commonly used to execute arbitrary code or download further malicious content.

Heuristics 3

  • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
23788b3e1e3d143e5d5bdf347cf7461b5c20bfddac254ab731a6223437e067b5		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
a9650bed4137a227387f875cdb56476e00037429458c82a7c547779d669552b9		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLe10NaTIVE 1663 bytes

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