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

Static analysis result for SHA-256 70cbb6ca45c4d23b…

MALICIOUS

Office (OOXML) / .XLSX

611.5 KB Created: 2022-08-10 18:51:50 UTC Authoring application: Microsoft Excel 16.0300
MD5: 33befe584a0a8e659e29c8ce5129f61f SHA-1: 32236fd8f2c9d1b62e4633c72bbe5c38107d56c8 SHA-256: 70cbb6ca45c4d23bfd817fc0a822b7907f281ae01602fcedbf5cc7e634f8422a
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Office Open XML spreadsheet containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, suggesting it is being used to exploit a vulnerability for client execution. The document body appears to be tabular data, likely a lure to disguise the malicious embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/zqe.Sgrx 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
e8309a13082cd729adba42e338e08b9f62a7b46d4e6f0f81ee266c8c9d9c7b68		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/zqe.Sgrx 921600 bytes
ooxml_oleobject_00_ole10native_00.bin
e9839b9d4cf2ce0f90efc6ed1500b74860994f639128fff9e2a05c5d59f5faba		 ole-package OOXML xl/embeddings/zqe.Sgrx Ole10Native stream: OLe10NATIVe 911790 bytes

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