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

Static analysis result for SHA-256 09ab6cbe2e3f6ba9…

MALICIOUS

Office (OOXML) / .XLSX

735.9 KB Created: 2021-08-09 02:12:21 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-03-16
MD5: d8fdcb0e44f5ceeab2d516d93cc08df7 SHA-1: 6aff283f855c07285e74a55c23f84a1cc0b22b48 SHA-256: 09ab6cbe2e3f6ba90584b1d8ffb69d84135cf84c3a13400c8923d1ad36218c87
140 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is an Excel document containing an embedded OLE object, specifically identified as an 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 or a similar vulnerability to achieve arbitrary code execution.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/ctsR.8SyA 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
a06d191ff7cb9d5afdd6d85b13438ab53c97dd03f5932ac2e654a7b6928c3ef0		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/ctsR.8SyA 1010688 bytes
ooxml_oleobject_00_ole10native_00.bin
5e1a3a435961888b5de5a87e568c7ba5954b264078bbe8a8badc5901aaecb6cc		 ole-package OOXML xl/embeddings/ctsR.8SyA Ole10Native stream: oLe10NAtive 1000049 bytes

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