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

Static analysis result for SHA-256 23eeaa58ccb321f5…

MALICIOUS

Office (OOXML) / .XLSX

717.0 KB Created: 2023-01-10 08:32:22 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-01-13
MD5: 8b640848dccb81c818b9371f4d2861c9 SHA-1: 4766f3eb5b9ba746af582dea9aea9f4074a2fcbf SHA-256: 23eeaa58ccb321f50d24e90125d7ef3bb6e13f3af4674d802a5a42925a3b0307
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1559 Component Object Model Hijacking T1059 Command and Scripting Interpreter

The file is an Excel document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate this object is anomalous and carries a payload, strongly suggesting exploitation of CVE-2018-0798. The embedded OLE object likely serves as the initial vector for executing a secondary malicious payload.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/bp1Q.dBT 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
dc5f8ff997dad782b2dc18260917d3fbcae25749838d0e4fa78786d7cee6e0a9		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/bp1Q.dBT 1030144 bytes
ooxml_oleobject_00_ole10native_00.bin
e3bfa52e4546ae9b7eb3a3783f5d61e0fd5222eb5d36e3c761ad55e6cd740bde		 ole-package OOXML xl/embeddings/bp1Q.dBT Ole10Native stream: OLE10natiVE 1019480 bytes

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