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

Static analysis result for SHA-256 f3e7f68430934e19…

MALICIOUS

Office (OOXML) / .XLSX

829.5 KB Created: 2021-08-09 02:12:21 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-09-27
MD5: 100959adfeea88d0b3026adffa0356a1 SHA-1: bc1b255735f03b5f9b4d43cf2f308b9f2531e08f SHA-256: f3e7f68430934e19e618b8d6772b90ac3a7d42369058af3cdd35593266f28604
140 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The sample is an Excel file 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 object's stream 'Ole10nAtivE' is the likely carrier of the malicious code, which is designed to execute upon opening the document.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Ff.ZiLOsC 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
adf1c940548107b8f3305ff6416c83fe5177dd6760f73f681ae6b053593fd33f		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Ff.ZiLOsC 1084416 bytes
ooxml_oleobject_00_ole10native_00.bin
3b2cdc6ea3f58ba4dee019d92823058625d70352f94c8e7065a1c9024242eecb		 ole-package OOXML xl/embeddings/Ff.ZiLOsC Ole10Native stream: Ole10nAtivE 1073316 bytes

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