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

Static analysis result for SHA-256 f816fa2331018951…

MALICIOUS

Office (OOXML) / .XLSX

21.7 KB Created: 2018-09-05 11:05:59 UTC Authoring application: Microsoft Excel 12.0000
MD5: ea378102171e78f35cf5dd3543a82200 SHA-1: 283eaaa8ec0bb23ee2b070447bc3b0231ba599f3 SHA-256: f816fa23310189511527310951896f19f9b4496994b5e7e40df9f9f8e661bc0e
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 an Equation Editor object. High-severity heuristics indicate the presence of CVE-2018-0798, an anomaly within the Equation Editor's native stream, which is a known vulnerability for arbitrary code execution. This suggests the document is designed to exploit this vulnerability upon opening.

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
13cad24d51b300bff348c57107e49ee7216cdfca4eb83497efb207f65fa897d7		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
4b753f1089925053185668cf0ef8f6ccf6692f9d64ba4c4271d2f30345096b83		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10NaTive 1880 bytes

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