Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 94c740eca43eb749…

MALICIOUS

Office (OOXML)

880.5 KB Created: 2021-02-03 07:57:22 UTC Authoring application: Microsoft Excel 15.0300
MD5: 4875b1f2ce1ecb125b3e6dac3219b492 SHA-1: f3a1e46e08ccfa2ed31430acf868714d15380dab SHA-256: 94c740eca43eb74974ffb7cb15bd6ca1b34c4751e5cbc415f2ad3f2bdbed450b
140 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file contains 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, strongly suggesting exploitation of CVE-2018-0798 or a similar vulnerability in Equation Editor for client execution. No specific family could be identified from the available evidence.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/tFtS7IkF.JGA2 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
46e5e83e0009e6f6e6790276976c0892f711bd6e4171ffcd054c0885a29dfe4d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/tFtS7IkF.JGA2 1217536 bytes
ooxml_oleobject_00_ole10native_00.bin
9d3ce2056c6ba6a4e4621b9d12d489a87acb03a6b81c1954c03a443bf4fa35ef		 ole-package OOXML xl/embeddings/tFtS7IkF.JGA2 Ole10Native stream: ole10NaTiVE 1205735 bytes

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