Office (OOXML) malware analysis — malicious · a0961212c3823799

MALICIOUS

Office (OOXML)

3.99 MB Created: 2021-04-28 21:02:36 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2021-06-17

MD5: 5acf94e794a48d4aa7d4f56d3f560ee5 SHA-1: c4528f11ba26d2c763699140a47e164cb65ce451 SHA-256: a0961212c3823799128e5132cfd1a25529b71ba6715a40c44fb2df3c6d1da621

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The file is an Office document containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate this object exploits CVE-2018-0798 via an anomalous native stream, which is a known method for executing arbitrary code. The high entropy and size of the Ole10Native stream strongly suggest it contains a malicious payload.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/Cb.cB 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/Cb.cB	4423680 bytes
SHA-256: `51c627e0fd3993720f8705186eec965446df1a0f58fd1b6ebb767bc1e865a916`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.93, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin`	ole-package	OOXML xl/embeddings/Cb.cB Ole10Native stream: Ole10Native	4386320 bytes
SHA-256: `6bb172d08666b264c2f648e8161ea2f436d62198afabd7ed725354145fa8dd24`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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