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

Static analysis result for SHA-256 7d58393a4d8a75ed…

MALICIOUS

Office (OOXML) / .XLSX

1.07 MB Created: 2022-09-30 00:41:36 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-10-03
MD5: 632e40adb31948fef03456f697b62ce8 SHA-1: 87d9236e16a5aa7da9e9897353727c2ab3491f5e SHA-256: 7d58393a4d8a75ed891f8bc6e2e1bc6cecd0eefae56bac9f2cd802ce1b828d09
140 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The file is an Excel document containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. Heuristics indicate anomalies in the Equation Editor's native stream, consistent with exploitation of CVE-2018-0798. 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/Nc.RoNs 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
41930f32d36c81d144f2b45dcef2f511e6a210f644468506584475fdf8134e63		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Nc.RoNs 1445888 bytes
ooxml_oleobject_00_ole10native_00.bin
ad55cf7edade0c5d324eb7a4cb0453b0e02abcebfa9af0a79af3ecccd6dde094		 ole-package OOXML xl/embeddings/Nc.RoNs Ole10Native stream: Ole10Native 1431738 bytes

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