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

Static analysis result for SHA-256 2dad5db626bfa7cd…

MALICIOUS

Office (OOXML) / .XLSX

713.2 KB Created: 2021-08-09 02:12:21 UTC Authoring application: Microsoft Excel 12.0000
MD5: 3e8436d73042bbc73f6573e2d74905fe SHA-1: 0eea3bd95dbdadfca5d1ab329eb2e8eef0886513 SHA-256: 2dad5db626bfa7cd8e3bdb71843bcdde1229fd1ea350b90d4ae4ef729a97b3b4
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1566 Phishing T1204.001 Malicious Link: Malicious File T1566.001 Phishing: Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is an Office Open XML (OOXML) file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object is anomalous and carries a payload-like Ole10Native stream, strongly suggesting exploitation of CVE-2018-0798. This vulnerability allows for arbitrary code execution when the embedded object is processed, leading to the delivery of a malicious payload.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/aeGB.SVjN 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
1ceafd3fcce4ea55e6299a6ba9ed7185ae6d7e53109f2b9b65bb53869d7bb849		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/aeGB.SVjN 928768 bytes
ooxml_oleobject_00_ole10native_00.bin
5a321bb710a5794249ec71131c95a7ecf7839cf2d5a8ff6b2abbbe39d9305d43		 ole-package OOXML xl/embeddings/aeGB.SVjN Ole10Native stream: ole10NAtIvE 918861 bytes

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