Office (OOXML) / .XLSX malware analysis — malicious · e35e15c19c1b323e

MALICIOUS

Office (OOXML) / .XLSX

65.0 KB Created: 2020-06-18 10:05:01 UTC Authoring application: Microsoft Excel 15.0300

MD5: e2b99a07402f324aa5713c3d09b25c33 SHA-1: 5c65a16c7f4340d24ea45e16b726176dd30738ad SHA-256: e35e15c19c1b323e282a393bc9c1da86d2a14a5965d97babf900a856b6db1bfd

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The file contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate this object is anomalous and exploits CVE-2018-0798. This suggests the document is designed to leverage this vulnerability for initial execution, likely as part of a spearphishing or social engineering attack.

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` `e6d12f3df094921b284aed441c985b66ff4ca39aa4b6915333c0f66c5b6e89d9`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	61952 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.92, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `2b4ba0dcea62ac7717179ec62ed903b96c733ee01cc091fe90f8a72de64c0a23`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native	59157 bytes
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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