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

Static analysis result for SHA-256 ceee9ac632850752…

MALICIOUS

Office (OOXML) / .XLSX

637.5 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-07
MD5: 6950cd4386ff4fd8578866f00c1d93f0 SHA-1: c1fb423a9e5f4fda9a9398fc3b525db93f641cda SHA-256: ceee9ac6328507524e729785fec3fc1d6a642c6d0df85a81612094130d0af6d0
100 Risk Score

Malware Insights

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

The file contains an embedded OLE object, specifically identified as a Equation Editor object with an anomalous Ole10Native stream. This strongly suggests exploitation of a vulnerability within the Equation Editor component to execute arbitrary code. The presence of the Ole10Native stream, which appears to contain a payload, indicates the likely delivery mechanism for a secondary malicious component.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/RyB.vBq contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • 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
c3e474cda952d8ff67d6720c5bc1c5270cc5d26e4e4a5ef3d9eb504767825a41		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/RyB.vBq 953856 bytes
ooxml_oleobject_00_ole10native_00.bin
a11df33d3606fbecaaa2c4f48c32f3b2f99aec2b72563b106fb639ee1868377a		 ole-package OOXML xl/embeddings/RyB.vBq Ole10Native stream: oLE10NatIVe 943866 bytes

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