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

Static analysis result for SHA-256 2c970426bc6e6e4c…

MALICIOUS

Office (OOXML) / .XLSX

16.5 KB Created: 2018-01-03 12:53:11 UTC Authoring application: Microsoft Excel 15.0300
MD5: 3620afeeb02f11007ee072fafe0e2fab SHA-1: 3bfe5b1917b8786ca51d01ec64d49d6ba75f741e SHA-256: 2c970426bc6e6e4c5cd9f043045da6b0bac7df4ea0cec67e6fd9bf4f1d009349
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798, a vulnerability affecting the Equation Editor. This suggests the document is designed to execute arbitrary code upon opening, likely leading to a second-stage payload download or execution.

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
fec9f2088b8a28a42f1f00cbbea59d84093a1c6b0d796d58571b92d4ab10ea49		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
f8bbfca599a0efa069858d7c73ea1d2e903decb2645aca26ba2689379a5e34ef		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10NAtiVe 1566 bytes

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