Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 250304951e7b3dc9…

MALICIOUS

Office (OOXML)

10.7 KB Created: 2019-01-14 17:17:08 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2020-07-24
MD5: 43c4a95390a57b64f3f9083cb8071f9b SHA-1: e38e078485e5448c2865c9965ec1204a645034e7 SHA-256: 250304951e7b3dc9fd7c0e20afede1d4551d620ea21d32eae2bc94f4b37bb21d
100 Risk Score

Malware Insights

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

The file is an OOXML document containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate this object is anomalous and exploits CVE-2018-0798, a vulnerability allowing for arbitrary code execution. The document body contains what appears to be tabular data, but the primary malicious functionality stems from the embedded exploit. No scripts were extracted, and the family is unknown.

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 3584 bytes
SHA-256: c064208ec31e4e44d6d71b5efb7b496303630920d4bbd4f912dcc1688ba35f6f
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10NatiVe 1398 bytes
SHA-256: 58b4f2020a93aaa1d58e837223a317f731d5c428d764f0003457e6584ec47211

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