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

Static analysis result for SHA-256 7e1dfb18bd946270…

MALICIOUS

Office (OOXML) / .XLSX

182.4 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 16.0300
MD5: 2a454833b69e4f9b9b2622051c15a195 SHA-1: 13fef9ae3a4895fb87e48a57cc8da4b3daf4a0fc SHA-256: 7e1dfb18bd9462700b13f9f564f339639ff4832908128440a4fadc35494777ce
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel document containing an embedded OLE object identified as an Equation Editor. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798 due to an anomalous native stream within the Equation Editor object. This vulnerability allows for arbitrary code 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
27e58c2d19854f0d638964c2de0ade934b50447f0efec05b28777cc4bf91ae38		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4608 bytes
ooxml_oleobject_00_ole10native_00.bin
3b9533971f4016965782818b43536fb4140ca9e57178b6aa13ebdf6ebf99ff6d		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10NatIvE 2137 bytes

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