Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 2a4cc259aa690189…

MALICIOUS

Office (OOXML)

15.2 KB Created: 2016-09-30 10:43:03 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2018-10-07
MD5: 3765343f43ce958c2adf8ff5e51329c7 SHA-1: feb6c22b4f75da9d23485eda9c58dd9e18ab6a0f SHA-256: 2a4cc259aa6901890d9f0a74bca4519e6f97dfe56b15e13400ae091a902000f2
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. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798 due to anomalous native stream data. This suggests the file is designed to execute arbitrary code via the vulnerable Equation Editor component.

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: a798fe61b54c4fc9fe9106bc81a822fb4132c463f0eb01bafaa20cc3f4b0ec80
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 1950 bytes
SHA-256: 8d401f39952e8c9d0be2c80786eb49eb1adc92f89a12091ef0f606df6081d63b

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