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

Static analysis result for SHA-256 37d918f61361b318…

MALICIOUS

Office (OOXML) / .XLSX

857.5 KB Created: 2021-08-09 02:12:21 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-10-27
MD5: ad543ad3e2872d7d7334c1169d3ba16d SHA-1: a13ef33d31cca98c44e51984a472d3c4853acbfa SHA-256: 37d918f61361b318e56c03e1797792764a84764492f53636de89badb80a08edc
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. Heuristics indicate anomalies consistent with CVE-2018-0798, suggesting the Equation Editor is used to exploit a vulnerability and deliver a payload. The embedded OLE object and its native stream are the primary indicators of this malicious behavior.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/U2Z.9x 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
341d47c36fc3a43a56be1ea2caff491bf7437b273898a9b15493314bc438cdfb		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/U2Z.9x 1207808 bytes
ooxml_oleobject_00_ole10native_00.bin
4ad1ae615c977179ef4628c749e60958ea37c7bb50702e48cf943628bb87502f		 ole-package OOXML xl/embeddings/U2Z.9x Ole10Native stream: oLe10nAtIVe 1195837 bytes

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