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

Static analysis result for SHA-256 252db8ee3c10aeb1…

MALICIOUS

Office (OOXML) / .XLSX

8.7 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: 1a03e1c83f77a1530ab877f49eb5d847 SHA-1: c6b5ccdfbce66dacdaa5873cc3193cb0f5417ffb SHA-256: 252db8ee3c10aeb1589590a3866ed4ef1e4824656916c1c1b2ae3f2f6b51ab80
100 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 a Microsoft Equation Editor object. High-severity heuristics indicate this object is anomalous and likely exploits CVE-2018-0798, a known vulnerability allowing arbitrary code execution. The embedded object is the primary vector for exploitation.

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
9bd577ce09cf8d048e25966e01cd005d365b971fb47b7a24c0e05309734c667c		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
6a7b58af2d304105cf6ae82e87961332887f0eb7ea458b02ecff62b6c50870ca		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OlE10NatIVe 1689 bytes

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