Office (OOXML) malware analysis — malicious · 79b2f744d338299e

MALICIOUS

Office (OOXML)

37.5 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2021-05-22

MD5: 536808cceef80f0f4f96977f8b66d76e SHA-1: ad45fa5a8248a49a3eb31051b846e5e976ca0473 SHA-256: 79b2f744d338299e1ac603f869782e6a42c00217007d8c897cb404a81b0937c9

100 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is a malicious Microsoft Excel document containing an embedded OLE object that exploits CVE-2018-0798 via the Equation Editor. This vulnerability allows for arbitrary code execution when the embedded object is activated.

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`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	4096 bytes
SHA-256: `38f78ce0d94e054f243c8247e4cdd4c76407ed65cc630539c9a0a44e91837ed7`
`ooxml_oleobject_00_ole10native_00.bin`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLE10NatIve	1762 bytes
SHA-256: `85556aa56a513231dd01f55bff746e095de594deb1f499f2918ee8227b080719`

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