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

Static analysis result for SHA-256 f3b645704b712938…

MALICIOUS

Office (OOXML) / .XLSX

672.1 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-24
MD5: 4b45ae6fffb9862d65afb6d8bb1256a0 SHA-1: 1474826ebc4294a0ef1dc3c17ff28e1c8f5b2aaf SHA-256: f3b645704b712938dc584f35a0b5d1370b9fb2dd07dac8cab0eba30c132856c1
100 Risk Score

Malware Insights

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

The high-severity heuristics indicate the presence of an embedded OLE object, specifically an Equation Editor object, which contains an anomalous Ole10Native stream. This structure is commonly exploited to deliver a second-stage payload. The anomaly in the Ole10Native stream suggests it is being used to carry malicious content.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/u5.xGwMF 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
cbe723ac43a66c5e51556820f779b4be7feafe52a6d6a044324614fb3683d8c2		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/u5.xGwMF 957952 bytes
ooxml_oleobject_00_ole10native_00.bin
018ee8fa64fcfe82731d2e52878636e0f6f5e444dd412d1da71e5b29f55ad53f		 ole-package OOXML xl/embeddings/u5.xGwMF Ole10Native stream: oLe10natiVE 948184 bytes

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