Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 6af2ee2953446e1c…

MALICIOUS

Office (OOXML)

799.9 KB Created: 2021-02-03 07:57:22 UTC Authoring application: Microsoft Excel 15.0300
MD5: eb03a52318dbcff5c4779372d3608102 SHA-1: a75d38d7d24e1cc52bdbdecbecba7dee403849f8 SHA-256: 6af2ee2953446e1c26b72dde009ab073bf39cb77d90a22a0df09681b62cf3d3a
140 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an OOXML file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this object is anomalous and carries a payload-like stream, strongly suggesting exploitation of CVE-2018-0798 or a similar vulnerability in the Equation Editor to achieve arbitrary code execution.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/WwQhvXPci.l3 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.
  • 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
71ad5b9a0706f30fc80a93988703fdcdf71727d647066809a16aeac11dd51981		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/WwQhvXPci.l3 1048576 bytes
ooxml_oleobject_00_ole10native_00.bin
2cce8ee185d4b2e993cd38af2a0bf42eba238ed9672d34936ef2640beb876c68		 ole-package OOXML xl/embeddings/WwQhvXPci.l3 Ole10Native stream: Ole10nAtiVE 1038024 bytes

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