Office (OOXML) malware analysis — malicious · 2d2a22c5413d0728

MALICIOUS

Office (OOXML)

518.9 KB Created: 2018-09-09 12:27:30 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2020-06-01

MD5: 3b7eefd8a09f4fcd2c4e0e1ba63ae5ce SHA-1: 5437f6f73e29a986e220f357a3925937b44d9095 SHA-256: 2d2a22c5413d07285921dd099f68eee6b66c3c70f567e080beb81a7c47df7e27

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is an OOXML file containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate this object exploits CVE-2018-0798 via an anomalous native stream, suggesting it's designed to deliver a payload. The document body contains a lure to 'ENABLE EDITING ABOVE FOR CLEARER VIEW OF IMAGE', which is a common tactic to bypass macro security and execute embedded exploits.

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	473600 bytes
SHA-256: `394a0e995acb8e41e4f94ac4de7995ddf354cbc61be8d56580ba5d32e2ba23d2`
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`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10nAtiVe	467032 bytes
SHA-256: `156831f43199ee3ab395ef49e8ab4312fa5ce9823e24ad60e4f4a53d041a5a06`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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