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

Static analysis result for SHA-256 3174c59112b25985…

MALICIOUS

Office (OOXML) / .XLSX

11.9 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 15.0300
MD5: b35da6b675d52153b45269ffced18721 SHA-1: 9066029fe0ad3e5c31eefa4a141312b002ee0547 SHA-256: 3174c59112b25985b8c1454e28c3e42dce2e6b44e3da96d891bfd25622e586ea
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample contains an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate a potential vulnerability exploitation, CVE-2018-0798, related to an anomalous Equation Editor native stream. This suggests the document is designed to exploit a flaw in the Equation Editor component to achieve 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
9e780cdfa48775e324e9fe257a5f6ea58ddf0974b8f37d9fc498afef99d8bd8f		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4608 bytes
ooxml_oleobject_00_ole10native_00.bin
a4f3fc352707226d4053580b37827c60e63dc53a6e62e92a8f34f9bc209a0090		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLe10NaTive 2081 bytes

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