Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 60143e30556da100…

MALICIOUS

Office (OOXML)

25.6 KB Created: 2019-07-22 18:46:12 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2019-11-20
MD5: 36a02125d16b9de4e28894ff15f08216 SHA-1: 37bcae43a6b81e958358b4657981757700d117f2 SHA-256: 60143e30556da100d51a431d808cf64319812a39b0ec5b7dd0ba1659a22add1f
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate a potential exploitation of CVE-2018-0798, a vulnerability associated with the Equation Editor. This suggests the document is designed to exploit this vulnerability to achieve code execution, likely for the purpose of downloading and running a malicious 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 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
SHA-256: ac4bca9d9b02336699cdb96d05440188782a87ac5e879ed46ee8f43f781e38fb
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10native 1955 bytes
SHA-256: 3b65ca6ae56b379bcf26b93793f4a2213176f6a47da834a18a172cec5b990af1

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