Office (OOXML) malware analysis — malicious · 6333b4ca6eda2e18

MALICIOUS

Office (OOXML)

1.02 MB Created: 2019-06-02 21:01:48 UTC Authoring application: WPS 表格 First seen: 2020-06-01

MD5: ed40882b94f64664c561623ba3f158b8 SHA-1: ab7e4fd40fa31d225c8583211f46d803a483674d SHA-256: 6333b4ca6eda2e18995e138132f6ef9da2b899e565adc4c10fafc2dd85d286ff

162 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an OOXML file containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate this object exploits CVE-2018-0798 via an anomalous native stream, which is known to carry a payload. The document body contains financial transaction-like entries, suggesting a lure for financial fraud or credential theft. No scripts were extracted, but the OLE object itself is the primary vector.

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
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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	1059328 bytes
SHA-256: `edd040186cd534ea098d84bb0d2f44b41f1047e7fd166acff4cfa32d927034d6`
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	1048565 bytes
SHA-256: `79506700330abfd32f0b5dae4a68d9f83ed6f3e36252cef72a92b11347c5d7e0`
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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