Office (OOXML) malware analysis — malicious · 3a33976368fa9cec

MALICIOUS

Office (OOXML)

581.4 KB Created: 2021-03-25 05:02:41 UTC Authoring application: Microsoft Excel 12.0000

MD5: 1d9550759ccfcff86904b86ed36e6295 SHA-1: 51174b625ade013f9d46bd6f4884f3eaafc60f84 SHA-256: 3a33976368fa9ceca1e958a2406cfbf34b55d4a91b674bd311e72ffdd0eab230

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is an Office document containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate this object exploits CVE-2018-0798 and contains an anomalous Ole10Native stream, suggesting it carries a malicious payload. The document body explicitly instructs the user to 'ENABLE EDITING', a common social engineering tactic to bypass macro security and execute the embedded exploit.

Heuristics 6

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
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
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` `a28319c46d82f91cbb5c632f8c499cf95bf7fde637b8844766324073215e1f70`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	591872 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `82e274a5e496fb6b23b2574028aedeea1977716b743b75da83551d9134eecaa8`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10NATIvE	584699 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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