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

Static analysis result for SHA-256 77d2cb8748c6d1b1…

MALICIOUS

Office (OOXML) / .XLSX

517.3 KB Created: 2020-01-20 17:22:23 UTC Authoring application: Microsoft Excel 15.0300
MD5: 17556396509a0775138f90b6a735ef49 SHA-1: 00fd676a09f70b948f23e2f6ac0bec0c45ba0880 SHA-256: 77d2cb8748c6d1b12395a20a6565389ee779644107e0b353076e47cb81952fc0
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Office Open XML (OOXML) spreadsheet containing an embedded OLE object. High-severity heuristics indicate this object is an Equation Editor component that exploits CVE-2018-0798. This vulnerability allows for arbitrary code execution when the embedded object is activated. No document body text or scripts were extracted, limiting further analysis of the payload.

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
7371d646fc2ee57a0290642ea3d09d09d6f95aa5fb07bde12236df29e587a85b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_00_ole10native_00.bin
8148d516d9ec542c2c88c49b7e3d5e6e3142fae3efa2ca476de32f778b3b8a1f		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10natIVe 1517 bytes

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