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

Static analysis result for SHA-256 1747c9eecb6f81f3…

MALICIOUS

Office (OOXML) / .XLSX

9.7 KB Created: 2023-09-27 08:05:40 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-26
MD5: 6d4657a962f0875afbd4a45f3ef94b78 SHA-1: 99694fd5f8b4bf5619e5019b3765d6079d8ed4c8 SHA-256: 1747c9eecb6f81f3b1ef91706439dfe2a5f9a6c3ee4f04ae2057d7aca6e6ced3
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is an Office Open XML (OOXML) XLSX document containing an embedded OLE object. Heuristics indicate this object is an Equation Editor component and specifically flags CVE-2018-0798, suggesting exploitation of a vulnerability within the Equation Editor to achieve arbitrary code execution. The document body is unreadable, but the presence of the vulnerable OLE object is sufficient evidence for this attack pattern.

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
d9480e5d22cb78dfff84e87dfc7c1b1531571f7d0527b4cdd34e26d6d9f1fa5b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_00_ole10native_00.bin
199f1d5354d0df0651cff506d8a43be11283279792b092a88cccb1496ffe038f		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10Native 1442 bytes

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