Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 9e948efab3423b37…

MALICIOUS

Office (OOXML)

9.0 KB Created: 2020-06-21 19:35:20 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2020-09-07
MD5: e155c6503119cc83b021f8af32665a08 SHA-1: 74b986dfc331d36b96fac6ddfd0282f8084e0740 SHA-256: 9e948efab3423b3789818be4dd585a52bb095ad90b044e5947b481fabc89c78e
100 Risk Score

Malware Insights

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

The sample contains an embedded OLE object identified as a Microsoft Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798, which allows for arbitrary code execution. This is a common technique for delivering malicious payloads via spearphishing attachments.

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: a161ddc28e617d4530354651bf71e0f329303799a668881ffa2882fca4d2786e
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLe10NAtiVe 1921 bytes
SHA-256: 4834891d9206cf9455fabdd915f3b4293506baec5352f346c5173e6cbf16926a

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