Office (OOXML) malware analysis — malicious · 0c573ee53e9f48e5

MALICIOUS

Office (OOXML)

178.7 KB Created: 2011-03-22 06:52:17 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2020-09-07

MD5: 74668c0b30721c869a0c7cc8365301f1 SHA-1: 9aa48e55ed59370900ac5a0f9f12b819204fe552 SHA-256: 0c573ee53e9f48e54bb4761f23a3abb8ec55d088b298209eca19f56735c27214

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 carries a payload within its Ole10Native stream. The document body contains a lure instructing the user to 'ENABLE EDITING' to translate language, which is a common tactic to bypass macro security and execute embedded malicious content.

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	173056 bytes
SHA-256: `301d12cb525ceb82d7d16aa0530076ba7ad16cf1329bc0d0087fe8f989b62341`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10NaTiVe	169250 bytes
SHA-256: `79da0fade282f10bae7b962ad8f96ea0c5068a6c235caaef4f6f9e87d4024cae`
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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