Office (OOXML) / .XLSX malware analysis — malicious · a00a914ba2393ab3

MALICIOUS

Office (OOXML) / .XLSX

15.3 KB Created: 2019-11-27 09:20:57 UTC Authoring application: Microsoft Excel 12.0000

MD5: 395f42dde546075dcb4c7c62905930b6 SHA-1: 37bf4b2d07def937223dcfd0b7943929edd610cb SHA-256: a00a914ba2393ab37f8692ec6d277b448a8378319c3679d34f34d990771ebbad

102 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The sample is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798 due to an anomalous Equation Editor native stream with high entropy. This suggests the document is designed to exploit this vulnerability to execute arbitrary code, likely leading to the download and execution of a second-stage payload.

Heuristics 4

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.
Embedded OLE object medium OOXML_OLE_OBJECT

Document contains an embedded OLE object
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` `8d5e3cca9e4dbe215dbdfd4b647e8a67f9ba810065afd0c37709b12f657191a4`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	9216 bytes
`ooxml_oleobject_00_ole10native_00.bin` `50e45191ae87feca25037a75789da11c0783ef623fbe46d26869b2d86a03b09d`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLE10naTivE	6287 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.95, consistent with packed or encrypted content.

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