Office (OOXML) malware analysis — malicious · ccf25a6aeb993b8a

MALICIOUS

Office (OOXML)

1.56 MB Created: 2019-10-12 05:59:56 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2020-07-24

MD5: c3dc0c1c74b9dd979676177f6f3e024b SHA-1: 51739013646887a7c1f2a60357e58ab8f82cf78c SHA-256: ccf25a6aeb993b8a655666ae334090839336e431976825c5c3d820ceadf1bc92

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object, which is known to be vulnerable. Heuristics indicate an anomaly in the Equation Editor's native stream, consistent with exploitation of CVE-2018-0798. This suggests the document is designed to exploit this vulnerability to execute a payload, likely delivered via spearphishing.

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`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	1638400 bytes
SHA-256: `b9d729f2ca83eab43cc1339641e6795b03243648a4fa2cd5657eb8878d8175c3`
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/oleObject1.bin Ole10Native stream: Ole10NATivE	1623134 bytes
SHA-256: `dcd8020edaa8894ad8ea2faa65d9b759cab29ce9afbc431402c5a53489809637`
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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