Office (OOXML) malware analysis — malicious · e79bdc7cf5750b05

MALICIOUS

Office (OOXML)

3.91 MB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300

MD5: e8f5459586d0fa96380b4d3699cc49ee SHA-1: f8572eae104e4678d4091045834b02ba56f584c8 SHA-256: e79bdc7cf5750b05ada33cdc8eb605a1aba4832be4ce9d219dec77e647d63f7e

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is a Microsoft Excel file containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate this object is anomalous and carries a payload, strongly suggesting exploitation of CVE-2018-0798 or a similar vulnerability in the Equation Editor to achieve client execution. No document body or scripts were extracted, but the presence of the malicious OLE object is sufficient evidence.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/kkH7U6k.oiQ 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` `61133185379c6cc0225ea013f7c21bbe245f80da4be2f07d607f393447d9c86c`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/kkH7U6k.oiQ	4459008 bytes
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` `63d25da84ac51da38a2a3e2f0eeb236e854a6921dcf31f4c3f68e5a19bf6fec4`	ole-package	OOXML xl/embeddings/kkH7U6k.oiQ Ole10Native stream: ole10NAtIVE	4421467 bytes
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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