Office (OOXML) malware analysis — malicious · a5038c24aaa4f208

MALICIOUS

Office (OOXML)

2.94 MB Created: 1996-10-14 23:33:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2019-11-20

MD5: 2347e4eacbe02dacb60f41edef0e219a SHA-1: f7ad149641ee3eb74ff8be2eded6ae467816c1d6 SHA-256: a5038c24aaa4f208d2b5cbad3fba6e0bbe25a029262993f9ee581593f96b77bc

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is an Office document containing an embedded OLE object, specifically an Equation Editor object, which is known to be vulnerable to CVE-2018-0798. The heuristics indicate an anomalous and high-entropy Ole10Native stream within this object, suggesting it carries a malicious payload. The document also contains a lure to enable editing, a common tactic for macro-based malware delivery.

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`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	3084288 bytes
SHA-256: `5d9002b487fdf051852be176cb23a80b648482c0b3cfce5dc6c581a99b085d82`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.96, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10nATIvE	3057547 bytes
SHA-256: `ca55cabea15849b41c0d9e47b97f2522c9c2d8fc4e88a44504eb62bbb168fef9`
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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