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

Static analysis result for SHA-256 c59569a4dcfea9ba…

MALICIOUS

Office (OOXML) / .XLSX

751.5 KB Created: 2023-01-19 05:24:18 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-01-27
MD5: 223722998eedb55be29303871403d229 SHA-1: c77a66ba6b49f19471eed470c7ab13c9574ec5e5 SHA-256: c59569a4dcfea9baca6013c1abdc304577907e8cc1659fc8df93d6bb48129845
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 Office document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this object is anomalous and carries a payload, strongly suggesting exploitation of CVE-2018-0798. The embedded OLE object and its anomalous native stream are the primary indicators of malicious intent, likely serving as a dropper for a secondary payload.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/QBEX45K8.SYfqf 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
f4e50ea4a33cd7c99ead48a97a5419b151774f34d4aa51db533cf6637e376cba		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/QBEX45K8.SYfqf 1059840 bytes
ooxml_oleobject_00_ole10native_00.bin
ba93bf5cedd7e51c61f339639c445a426152d6e5075aa75b53136a978503f21a		 ole-package OOXML xl/embeddings/QBEX45K8.SYfqf Ole10Native stream: OlE10NAtIVE 1048994 bytes

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