Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 ba4f51eaf995fe64…

MALICIOUS

Office (OOXML)

696.4 KB Created: 2021-02-03 07:57:22 UTC Authoring application: Microsoft Excel 15.0300
MD5: 8d79787f6dfbcc19926c78332cee67e7 SHA-1: cc49a74b20ed1385fa60a8739b85d15fa9ef5c4f SHA-256: ba4f51eaf995fe64eb8da820d20edc3bad403486cb091fc1832883c3feea54fb
140 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate that this object is anomalous and carries a payload, strongly suggesting exploitation of CVE-2018-0798 or a similar vulnerability in the Equation Editor to achieve arbitrary code execution. No document body or scripts were extracted, but the presence of the exploit object is sufficient evidence.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/z21B4EOQV.DkO 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
843976602a87dd0457f2d3ec6a268856c8ef80d4689a7812bed2f79d733ad1f4		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/z21B4EOQV.DkO 1004544 bytes
ooxml_oleobject_00_ole10native_00.bin
681c1e2065be950abc0882495045c0d7e01faecc689aa8b6addb15f1e09a5da4		 ole-package OOXML xl/embeddings/z21B4EOQV.DkO Ole10Native stream: ole10NAtIve 994167 bytes

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