Office (OOXML) / .XLSX malware analysis — malicious · cc0bd51fc94f09e9

MALICIOUS

Office (OOXML) / .XLSX

99.1 KB Created: 2019-05-27 22:54:04 UTC Authoring application: Microsoft Excel 16.0300

MD5: ce5aca1ee87566a0d2e2fe1f8c37f0d2 SHA-1: 23f49e73597e8b4aea51c884f70abb1d99eddce0 SHA-256: cc0bd51fc94f09e99e8c522d61852599e857bace1de701fd05d1863865cacb3c

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1559.001 Component Object Model and Distributed Component Object Model

The sample is an Excel file containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. Heuristics indicate anomalous native stream data within the Equation Editor object, consistent with exploitation of CVE-2018-0798. This suggests the file is designed to exploit this vulnerability to execute a payload.

Heuristics 5

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.
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` `a9299095624247a810b51e5fc2611e437bb1fdb818c590f8bacdd821c457cbda`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	97280 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.95, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `c96a705e49e40e8c3f097c0562f9fe3c876acc25e246959c97a3fd7a4a6b2b1a`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10nATIVE	93997 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

Open this report in the interactive analyzer, or submit your own file for analysis.