Office (OOXML) malware analysis — malicious · bfd3e0f9163f32c2

MALICIOUS

Office (OOXML)

8.7 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300

MD5: 7d79f14d3e4c9d82a895909a9e4a95aa SHA-1: fbe22266ea464674d9bd7ba129e7170f0a37baac SHA-256: bfd3e0f9163f32c20f6fd15ed367ddc05b75cf7b4a7c7e53c13c353f829c306b

100 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798, which allows for arbitrary code execution. The embedded object is the primary vector for this attack.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/oleObject1.bin contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY

Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
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` `527d92c5d69061ff953bd9ea969385d0556096ef70760d458d6579c8128e112a`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	4096 bytes
`ooxml_oleobject_00_ole10native_00.bin` `0594f279d37ee2db493f21ebeb7d877ac1b99973229550cc856a8d11c0a998ad`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLe10nAtIve	1833 bytes

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