Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 162521bab91173eb…

MALICIOUS

Office (OOXML)

8.9 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: 0e88e4a4a579cebe36e473037d6a175d SHA-1: f5da8455be8b59004ef21e256e2b8f0169c3514f SHA-256: 162521bab91173eb11edda85e4681f5e349dc2501a6f97c2be0bf862ac7f6f40
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel document containing an embedded OLE object identified as a Microsoft Equation Editor object. Heuristics indicate this object is anomalous and exploits CVE-2018-0798, a vulnerability allowing for arbitrary code execution. The embedded object's structure suggests it is designed to trigger this exploit upon opening.

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
2ca3f1dd00ee41b2f6e354b93b87877db5f7d3d3ed1be429db5b14f13c5c45b5		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
56e86556b587f38f688ce0357e0e700b212866810706e74589a92157f950e082		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10NAtIve 2018 bytes

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