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

Static analysis result for SHA-256 8838d51cf351ed8c…

MALICIOUS

Office (OOXML) / .XLSX

927.9 KB Created: 2022-06-01 11:53:05 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-06-02
MD5: d4d7649b242926a8fd135cc194475e1f SHA-1: f7d015ca24d7d6d7a02f58ca7083bb779668b8a6 SHA-256: 8838d51cf351ed8c0223543ba81057fc0f16ad6ba6630f77310ff8336e98d24e
140 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel spreadsheet containing an embedded OLE object that leverages a vulnerability in the Equation Editor (CVE-2018-0798). This exploit allows for the execution of arbitrary code, likely to download and run a secondary payload. The high entropy and anomalous native stream within the Equation Editor object strongly indicate a malicious payload.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/WqSKGig.HB7r 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
d15528c95e4daefb37c40b94b0dc0ee9e9edea74d6841933186231f64fffe104		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/WqSKGig.HB7r 1243648 bytes
ooxml_oleobject_00_ole10native_00.bin
5bfd146893067fd08bf9310d85077dd1076e7537ea22f77c0093dc8d3f175806		 ole-package OOXML xl/embeddings/WqSKGig.HB7r Ole10Native stream: Ole10Native 1231428 bytes

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