Office (OOXML) malware analysis — malicious · b4619abe822feba8

MALICIOUS

Office (OOXML)

1.19 MB Created: 2021-02-03 07:57:22 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2021-07-10

MD5: 9b170293abdb279188efe34f697c791e SHA-1: 0174929819415877693c3f31d03ce9fde8101c85 SHA-256: b4619abe822feba81df588dbebe650d59af0a85aecd7a7e75049fb328866f138

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The file is an Excel document containing an embedded OLE object, specifically an Equation Editor object. High-severity heuristics indicate that this object is anomalous and likely contains a payload, exploiting CVE-2018-0798. The embedded object's native stream is suspicious and suggests arbitrary code execution capabilities.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/9ReUV.wu 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.
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
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

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/9ReUV.wu	1554432 bytes
SHA-256: `bffb60d60f79c79904987c60a3da4602ff299c1cf8630fc43c6ecc6ca985ab71`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin`	ole-package	OOXML xl/embeddings/9ReUV.wu Ole10Native stream: ole10NAtivE	1539842 bytes
SHA-256: `2d6cd3997f1eae1d15807cf7357e3b3bbdb8089c069f7055a7962514b54aa452`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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