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

Static analysis result for SHA-256 7cf620bee4868c71…

MALICIOUS

Office (OOXML) / .XLSX

694.8 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-09-06
MD5: 2350526617adca73e4d8929e141d6f2f SHA-1: 9999feceb1fd1c9aa729d8829deb3a234859fbc8 SHA-256: 7cf620bee4868c7120eed0ec20488780a23f9056ed0ce4495697136f928a31d2
100 Risk Score

Malware Insights

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

The file is an Excel 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 with an anomalous size and header, strongly suggesting exploitation of a vulnerability like CVE-2017-11882 for client execution. The embedded object's path and stream name are the primary indicators of compromise.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Pbo.oe6Wwrv 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
6d8ffa4203bb8263bd480d4b1c37ad77be2c08587116550435d22b11179d4a6e		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Pbo.oe6Wwrv 971776 bytes
ooxml_oleobject_00_ole10native_00.bin
e72ec76b6370e3aea2a36e7729af118250ae4fa91d67ffb6f02a7480e0f69583		 ole-package OOXML xl/embeddings/Pbo.oe6Wwrv Ole10Native stream: OLE10NaTiVe 961986 bytes

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