Office (OOXML) / .XLSX malware analysis — malicious · deaa89e19742ec70

MALICIOUS

Office (OOXML) / .XLSX

725.0 KB Created: 2023-08-28 23:37:50 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-30

MD5: fe1e0a3aa4dbcbef1b4bacccff150b9b SHA-1: b4c9fc09752784bb0b8ad24f02b850121ab9015f SHA-256: deaa89e19742ec702f87db2f0aea535716bea4330c3bef595fd016901735deef

100 Risk Score

Malware Insights

MITRE ATT&CK

T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The sample is an OOXML file containing an embedded OLE object identified as an Equation Editor. Heuristics indicate an anomaly in the Ole10Native stream within this object, suggesting it carries a payload. This technique is commonly used to exploit vulnerabilities or deliver second-stage malware.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/XG.FMc2 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.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin` `32d96e964ac41f376356038eec187b2270a5b94d77a0604c91308ef22c83bf2a`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/XG.FMc2	1045504 bytes
`ooxml_oleobject_00_ole10native_00.bin` `0c159b6aa464d246bf59833084daaa645fd7625832e38ccb721d4cf0e026190a`	ole-package	OOXML xl/embeddings/XG.FMc2 Ole10Native stream: OLe10NATIVe	1034812 bytes

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