Office (OOXML) malware analysis — malicious · 3e613655ec3b3f3f

MALICIOUS

Office (OOXML)

559.5 KB First seen: 2019-01-20

MD5: 07460d10079d2bb9347f320751575ebf SHA-1: 1d8fead5723b765a0850daee6643c1fa755bd7f1 SHA-256: 3e613655ec3b3f3fb37bdcaf9d6e07a4f96f4f8c160a86346b88746aedb66c65

100 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample contains an embedded OLE object identified as a Microsoft Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798, which allows for arbitrary code execution. This is a common technique for delivering malicious payloads via spearphishing attachments.

Heuristics 3

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

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	4096 bytes
SHA-256: `98ccf44217bb3a9c5a1e8d19862646612842e9794ba8a10345f8797712a22888`
`ooxml_oleobject_00_ole10native_00.bin`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native	1925 bytes
SHA-256: `a73661f7bd1d70fb18a4b03ee4142fba3aa5d9dc75fd4ba793702cf3cbcb30a0`

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