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

Static analysis result for SHA-256 65b63f4f75c7b4e0…

MALICIOUS

Office (OOXML) / .XLSX

10.9 KB Created: 2019-01-14 17:17:08 UTC Authoring application: Microsoft Excel 16.0300
MD5: 73a3ed6e5cf778ec28530163eca61923 SHA-1: 5d254d50d09be60a553efcb74e064eace8fc2846 SHA-256: 65b63f4f75c7b4e0c164a93957996ce074fc3a0e7a42d56fa53137ea2c060e5f
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an Excel document containing an embedded OLE object identified as an Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798, which allows for arbitrary code execution. This technique is commonly used to download and execute a secondary payload, making the initial document a delivery mechanism for further malicious activity.

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
b8b3cffec56b4035171377827772cb4c55ab6bf05160cabd9868a26cbe50e3d7		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
681e0ff67517ba7d62235b9b930763e38e3cf795257133c8bc4029b081686ae1		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10NatiVe 1642 bytes

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