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

Static analysis result for SHA-256 6ddb6746cee09a46…

MALICIOUS

Office (OOXML) / .XLSX

661.5 KB Created: 2023-01-19 05:24:18 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-03-30
MD5: 8e7f14deb38489a62ae9486534542dd2 SHA-1: d9147978cc8b1c66ce8e24e82906521274990170 SHA-256: 6ddb6746cee09a46fa029ff420a94524169b8eb6f3915166cd58885dc78a25e4
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The sample is an Excel file containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate exploitation of CVE-2018-0798 due to anomalous native stream data within the Equation Editor object. This suggests the file is designed to exploit this vulnerability to execute a payload.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/hx2e.EjN 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.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • 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
a6acfa08130d3eaf4863203e4aa5514e3787b692f5d7fbbf541d52ae4dc25239		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/hx2e.EjN 906752 bytes
ooxml_oleobject_00_ole10native_00.bin
aecc8be3fc079a9f4a8a305899cba80ec44cbef98ab3b9ad1d452e456e7d8b23		 ole-package OOXML xl/embeddings/hx2e.EjN Ole10Native stream: ole10nATiVE 897242 bytes

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