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

Static analysis result for SHA-256 abfe523af5774d0d…

MALICIOUS

Office (OOXML) / .XLSX

37.5 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: ef7d61928153c7ac6dc3d692e9c42fcc SHA-1: a9081581a8dc0a3e75f45acb071265fccf4fc091 SHA-256: abfe523af5774d0d0f3f10533fc7143245a8c0e2985470a540537b22e03de592
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The XLSX file contains an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate a potential exploitation of CVE-2018-0798 due to an anomalous Equation Editor native stream. This suggests the file is designed to exploit this vulnerability for client execution, likely leading to the download and execution of a secondary payload.

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
7dab7a2b025e9ad5b779ab0b4d78ffa3e62b99350ad7a769c5b37e05e9511c37		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
e7d9953414bd87158e7e2a6cdb5dd8a58dc2729932bc690150dc1b2813b640c7		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10naTivE 1760 bytes

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