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

Static analysis result for SHA-256 38e70d025ae72c86…

MALICIOUS

Office (OOXML) / .XLSX

736.8 KB Created: 2023-09-27 08:05:40 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-29
MD5: 83f699d7efe46c48df712af7dca36ed1 SHA-1: d7e8f543ddc5e6dbe4dfc8e52f29dc9c3101b506 SHA-256: 38e70d025ae72c8671bc64c85954ccfd6da68c45cc8d490c318cfa4857390e0d
100 Risk Score

Malware Insights

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

The sample is an Office document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size, suggesting it is being used to deliver a secondary malicious component. The presence of this anomalous stream is a strong indicator of exploitation.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/FwGVmtw8.IIipOD 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
8ba3fd630b15c334462ec6580361a6e4261f3869bad0389093ee611d54419879		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/FwGVmtw8.IIipOD 1069568 bytes
ooxml_oleobject_00_ole10native_00.bin
2ccc96f139d000ac2bb775c151122c0dbe8f08adc9a7d4a79f564f37b27a98a8		 ole-package OOXML xl/embeddings/FwGVmtw8.IIipOD Ole10Native stream: ole10nATiVe 1058390 bytes

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