Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 a48c961c6783c0e4…

MALICIOUS

Office (OOXML)

10.3 KB Created: 2018-04-25 07:43:35 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2019-05-31
MD5: 874e0ab99a05d61e3a9437f1d5f260e1 SHA-1: e75cd8b9006092edc4bb18f367ff32d32583554d SHA-256: a48c961c6783c0e4789d6e262dc4d16d5a6d5531a64c524661443138a08ac1b7
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 a likely exploitation of CVE-2018-0798 due to an anomalous Equation Editor native stream, which is a known vulnerability for client execution.

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 4608 bytes
SHA-256: a2f7ea2c43fd43bfa6547cc788687860550858945e998f68451114d607338328
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 2141 bytes
SHA-256: 50a9d8971ee48ed6c0e7276cbb75708dac45aecbb75438f1e104f81883c5aee3

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