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

Static analysis result for SHA-256 f9eaefd06fb8a413…

MALICIOUS

Office (OOXML) / .XLSX

363.6 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: b9de320427cf3e86666f4b414dda4467 SHA-1: c6e4404d45e39f00709668f998a410d437601c46 SHA-256: f9eaefd06fb8a41353b1df7169fbf8f0236817fe3a388901965bf2519de2ceb9
100 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 a high likelihood of exploitation for CVE-2018-0798, a known vulnerability in Equation Editor. This suggests the file is designed to exploit this vulnerability to execute arbitrary code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oleObject1.bin 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.
  • 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
67e9496d844cd37dc7ab20285f94758f4a91a1be343bdd2f62fc5b8f3dcc16f2		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
55dc41f49448986b69f8ce9240bedb2f4fe1b4ad34d33ef0812dd628f8c709f5		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10naTIve 1660 bytes

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