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

Static analysis result for SHA-256 144fb1f6ffb03a56…

MALICIOUS

Office (OOXML) / .XLSX

686.5 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-07
MD5: 825dc7e5087201e51a8070cbb42e6bd5 SHA-1: a147d086ebc4b4be9b39e9a90efb7e887f39bd68 SHA-256: 144fb1f6ffb03a56e41d07b2a06bc3b3b65562c02cc3f9b15e137e7de1ada433
100 Risk Score

Malware Insights

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

The file is an Excel document containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's being used to exploit a vulnerability for initial execution. The embedded OLE object and its anomalous stream are the primary indicators of compromise.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/G3fbL.7IR90F 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
c4228e00ace9770af5f51c78fc32ccf4ac15c015eb70d21cc476e88f12b06f1c		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/G3fbL.7IR90F 996864 bytes
ooxml_oleobject_00_ole10native_00.bin
ecc22e9529b6a097f75c1dccf5c794fa9eaa6bdad349cb49b18bc57ca39777ec		 ole-package OOXML xl/embeddings/G3fbL.7IR90F Ole10Native stream: ole10nAtIvE 986470 bytes

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