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

Static analysis result for SHA-256 7c4be01c52f7c06e…

MALICIOUS

Office (OOXML) / .XLSX

692.7 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-13
MD5: 657be968ed9511a96230056310f0b119 SHA-1: ded4d35e9c0db37db42d590e8a0fb98e71c5417a SHA-256: 7c4be01c52f7c06eef5c9779daeb9d6fe47e32526ff75da2fe78bf19baa10af6
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1204.002 User Execution: Malicious File

The sample is an Office Open XML spreadsheet containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. This object exhibits an anomaly where the Ole10Native stream within the Equation Editor object appears to carry a payload, indicated by an impossible header and a significant size discrepancy. This strongly suggests the exploitation of a known vulnerability within the Equation Editor component to facilitate the execution of a secondary malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/gB45B.Ur 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
d3a8bb60690419534985b9477365e8e5cc9e3237329c7b1a27679098132ad157		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/gB45B.Ur 1018880 bytes
ooxml_oleobject_00_ole10native_00.bin
270a93a41360d066526f10abd21d96df08fd0fe4d9c981d0dd3a8e9f0aebca51		 ole-package OOXML xl/embeddings/gB45B.Ur Ole10Native stream: OLe10nATIvE 1008337 bytes

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