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

Static analysis result for SHA-256 64b60ee9c91fc4e3…

MALICIOUS

Office (OOXML) / .XLSX

724.4 KB Created: 2023-09-04 21:45:48 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-05
MD5: 153afa823f6b1d7166a255f0b9226018 SHA-1: 7ecd50cedb0b74ceb87b66c47aca4766f784df5e SHA-256: 64b60ee9c91fc4e3255f8fad1b88f497d59965242647f7ad12ee94acb09d5e26
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 a high-confidence anomaly. This anomaly indicates that the Equation Editor object is carrying a payload-like Ole10Native stream, suggesting it's being used to exploit a vulnerability for client execution. The embedded object's path and stream name are noted as IOCs.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/t6yL0.X4r 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
8f7f8ccfc9e4f78e87e7c951a883634de5107064f9c9a972308c81e67f99aebd		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/t6yL0.X4r 1038848 bytes
ooxml_oleobject_00_ole10native_00.bin
4dbf9c230b8549d155ad18a18f04fd76f5a2fa4603f5ba62be685ccf51a33b5d		 ole-package OOXML xl/embeddings/t6yL0.X4r Ole10Native stream: OLe10nATIVE 1028604 bytes

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