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

Static analysis result for SHA-256 98bb91d8c80f0600…

MALICIOUS

Office (OOXML) / .XLSX

828.2 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-09-08
MD5: 61482968d92f5fced3211a1ba2393656 SHA-1: c1559ffd8dd2b43b544b98ee611fb7a4b1598b3a SHA-256: 98bb91d8c80f060020b8b49a0a13a1c2cd0f3f5faf1aaad75b0825511ab06fd5
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 a vulnerable Equation Editor component. High-severity heuristics indicate an anomaly 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 malicious payload, likely delivered via the embedded OLE object.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/FK.GvMWaz 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
402d85f8eddeab9af4c5e2db92c627ed06bc725c6feaa7a03f2251ef15f39954		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/FK.GvMWaz 1147904 bytes
ooxml_oleobject_00_ole10native_00.bin
cd45a3c19c167b55e8f2d0d1e6f20af892519202fa4c36266864e58fe411ea3a		 ole-package OOXML xl/embeddings/FK.GvMWaz Ole10Native stream: oLe10Native 1136257 bytes

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