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

Static analysis result for SHA-256 3bbf024234c0a181…

MALICIOUS

Office (OOXML) / .XLSX

665.2 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-05
MD5: 0690fb5dc0beb23cbdec3c2bde4ea775 SHA-1: 908ad2870ba1b614f4e3380773b9509260a744ad SHA-256: 3bbf024234c0a181ba120013fe8429434599fb1ece37b1afa1b8af806bc95ad8
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking

The sample is an Office document containing an embedded OLE object identified as an Equation Editor. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size difference, strongly suggesting it's a dropper for a secondary malicious payload. The embedded OLE object and its anomalous Ole10Native stream are the primary indicators of malicious intent.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/sDww5.ooJ 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
44d9d49bd26f5f0575dad16795648e511fd9a04c74cbe036af5b47c075bd116b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/sDww5.ooJ 913408 bytes
ooxml_oleobject_00_ole10native_00.bin
accacca8b4405752f27f5f1852d48ae4ce1a015d952ec0e973f0ab4813ded276		 ole-package OOXML xl/embeddings/sDww5.ooJ Ole10Native stream: olE10NATiVE 904125 bytes

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