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

Static analysis result for SHA-256 5db05dae2f61af8e…

MALICIOUS

Office (OOXML) / .XLSX

617.6 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-28
MD5: 58863079381062d5603d3f8aa8299cbd SHA-1: f40ac177e22854422654248d9d3dd6800c55b3a1 SHA-256: 5db05dae2f61af8e60762ca1ff387cdb0fe491759169a08edfd126b353609f92
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1559.001 Component Object Model Hijacking T1059 Command and Scripting Interpreter

The XLSX file contains an embedded OLE object, specifically identified as a Equation Editor object. This object exhibits an anomaly where the Ole10Native stream appears to carry a payload, indicated by an unusually large declared inner size compared to the stream size and high entropy. This strongly suggests the exploitation of a known vulnerability within the Equation Editor component to deliver a secondary malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Dc.d0 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
37d8be611f4eb5c9c8da6807675bffb3706bff546b3525a42cf067052f40e26d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Dc.d0 921600 bytes
ooxml_oleobject_00_ole10native_00.bin
e34298b533f94d9083318dbde979c1a4bfe1d43d1504ab3981854e26ec44271b		 ole-package OOXML xl/embeddings/Dc.d0 Ole10Native stream: OLE10NatIVe 911832 bytes

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