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

Static analysis result for SHA-256 720e2cec862dd3e2…

MALICIOUS

Office (OOXML) / .XLSX

685.9 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-09-20
MD5: a157b63ea2ee36307883349a18ad1cda SHA-1: 000634c03ec6f565e49cf6f25bb07941b4de692e SHA-256: 720e2cec862dd3e25f771316a18d903c78b4dc1394b53ad48e93f54f6231a92b
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The file contains an embedded OLE object, specifically identified as an Equation Editor object. This object carries a payload-like Ole10Native stream with an anomalous header, indicating it's designed to execute malicious code. The presence of this anomalous stream within the Equation Editor object strongly suggests it's being used as a vector for delivering a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/T6flS8pn7.h0 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
f7f1a23c24ca1c29e35631374b9225d696029fde9eadf8d6e3477892444b0f8f		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/T6flS8pn7.h0 971264 bytes
ooxml_oleobject_00_ole10native_00.bin
38ad65259b82aaff622d7b63de101d520cfcc32b2501e7c346938ee34983c352		 ole-package OOXML xl/embeddings/T6flS8pn7.h0 Ole10Native stream: Ole10nAtIve 961438 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.