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

Static analysis result for SHA-256 6970867851040baa…

MALICIOUS

Office (OOXML) / .XLSX

736.3 KB Created: 2023-09-27 08:05:40 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-13
MD5: c9710a0bed42512aef47de8d2db451bf SHA-1: 9cb18695470cd77e58c279980b62d63735c8d879 SHA-256: 6970867851040baa1c702f9dc78e9beb7932b5ed22a4e8bf87e79cbffe7694f5
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model T1204.002 Malicious File

The sample contains an embedded OLE object, specifically identified as an Equation Editor object. This object exhibits an anomaly where the Ole10Native stream is significantly larger than declared, indicating it likely carries a malicious payload. The presence of this anomalous OLE object is a strong indicator of exploitation.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/TLcXFe5Hp.qN 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
9b6492f35b594a4ac2485a5a3f95e529f4af385984ce8c0dd349d807c301aaa1		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/TLcXFe5Hp.qN 1052160 bytes
ooxml_oleobject_00_ole10native_00.bin
0f68901ffcb430b42075f883fd3f078d07b82c96296bb0b77b2ebc8e1b6b2981		 ole-package OOXML xl/embeddings/TLcXFe5Hp.qN Ole10Native stream: Ole10naTiVE 1041197 bytes

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