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

Static analysis result for SHA-256 f9a14f17be86990f…

MALICIOUS

Office (OOXML) / .XLSX

659.2 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-13
MD5: 416d118d586818274deaa0e3605d599f SHA-1: 87f8fb87169a5b9ba804bf2de359eb67eecb0b82 SHA-256: f9a14f17be86990f67410df1898f1645525300d94359de554577d9f5f42c5345
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample is an Excel file containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's being used to exploit a known vulnerability. This points to a delivery mechanism leveraging a malicious attachment to execute a payload via the Equation Editor vulnerability.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/YFnFiIM.pIbVVmp 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
f0b2fe8be3b47c46c7c01380c84a1810a9a0f8099967febad1cebcc964a4f0d0		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/YFnFiIM.pIbVVmp 980992 bytes
ooxml_oleobject_00_ole10native_00.bin
32e339ee41238d7a69f678e7b7ef00f55c65870d34ea0fd86c112fd8ac3f5f1e		 ole-package OOXML xl/embeddings/YFnFiIM.pIbVVmp Ole10Native stream: ole10NATIve 971257 bytes

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