Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 1a00b10cbd4f1fcc…

MALICIOUS

Office (OOXML) / .XLSX

9.3 KB Created: 2018-09-17 07:54:41 UTC Authoring application: Microsoft Excel 16.0300
MD5: 47591519e8d2b820e977f79386065e6f SHA-1: cc2e8e8857718a7ec7f230e047aac788b4f35850 SHA-256: 1a00b10cbd4f1fccc068d889a099c2711d0ffe551476d82120ecbfc58fad40fb
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an OOXML file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate this object is anomalous and exploits CVE-2018-0798, a vulnerability in Equation Editor that allows for arbitrary code execution. No scripts were extracted, but the presence of the vulnerable OLE object strongly suggests an exploitation attempt.

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
1cdaae15af173e2325a202ad5d48272f09c4ff4dd0dae385076e1648368e2d59		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4608 bytes
ooxml_oleobject_00_ole10native_00.bin
4624bc2a66542f76f6a733eb7dcf1f69191b639d1d790830c8374cc74458cecb		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10NAtIVE 2228 bytes

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