Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 a8098e968b5178fb…

MALICIOUS

Office (OOXML) / .XLSX

117.8 KB Created: 2020-08-17 09:05:28 UTC Authoring application: Microsoft Excel 16.0300
MD5: a46f8fae4255b681d573a09ddc9cbae7 SHA-1: a419416cc0b3f43a1c2d9d74dfafa671bcc9d726 SHA-256: a8098e968b5178fb3c064bfdb17099f9f8e4526e6d4585671e2782c0eea04600
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious File T1566 Phishing T1566.002 Spearphishing Attachment

The file is an Office document containing an embedded OLE object, specifically an Equation Editor object. High-severity heuristics indicate the presence of an anomaly associated with CVE-2018-0798, suggesting exploitation of this vulnerability. This points to a likely attack pattern involving the exploitation of a software vulnerability to execute arbitrary code.

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.

FilenameKindSourceSize
ooxml_oleobject_00.bin
ecd55614f70b0c3eb9283fa7e3f02e2fbef4db3677dbba13dbc438fea4bdb5ac		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_00_ole10native_00.bin
7575a23fdaa8f0f2a2016c4c35500307cc5dd305a957d04ffe51623cf1eca05b		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 1417 bytes

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