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

Static analysis result for SHA-256 2416d5661422a2b0…

MALICIOUS

Office (OOXML) / .XLSX

37.5 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: 2d2de9e7bf5c1df270552b546f8b0892 SHA-1: db0864fee17a6d49cbb7c1b2c7d6fae9cf8b5761 SHA-256: 2416d5661422a2b0fd644c20db247a35aeb09cf952e1497daa7104b70ff44c0b
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Office Open XML (XLSX) file containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate the presence of CVE-2018-0798, an anomaly within the Equation Editor's native stream, which is a known vulnerability for client-side code execution. This suggests the file is designed to exploit this vulnerability upon opening.

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
51d6679b9383c35bb7ada180ed84184d3ebd37a74aed8ff1b94fe0c151c3fe4b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
dd98b20d552f8577def25f5fea07c5a31e1fc4f5bf8479b98e2e4d3e2cfa4357		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLE10NATIVE 1758 bytes

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