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

Static analysis result for SHA-256 76b60bea0fcfeb80…

MALICIOUS

Office (OOXML) / .XLSX

721.8 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300 First seen: 2022-11-16
MD5: 59a555ff4ead7d3bf8703c00bfc748fd SHA-1: 1efba980e5000f6d5e17a94d387c167c60b801fe SHA-256: 76b60bea0fcfeb8027c633fcffd7e1517b7c75f894d3f951132df5a9ac01f3bf
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: Malicious Attachment T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The file contains an embedded OLE object, specifically an Equation Editor object, which exhibits anomalies indicative of CVE-2018-0798. This vulnerability allows for the execution of arbitrary code, suggesting the Equation Editor object is used to deliver a malicious payload. The high entropy and anomalous stream size within the Ole10Native stream further support this conclusion.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/lI.xPPTW 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
3d0324e8c01c003a3e0200c394d44619688cd1dccb420853826f48fdd7d6891a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/lI.xPPTW 1056256 bytes
ooxml_oleobject_00_ole10native_00.bin
395b6676525a7d873c65d30c4c18b3c100feed0c612da45692c1bb85dd5810e8		 ole-package OOXML xl/embeddings/lI.xPPTW Ole10Native stream: ole10nAtive 1045271 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.