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

Static analysis result for SHA-256 7203a1a0c37ff4d9…

MALICIOUS

Office (OOXML) / .XLSX

16.6 KB Created: 2018-01-03 12:53:11 UTC Authoring application: Microsoft Excel 15.0300
MD5: 9022bbf2b21dfad43b859ded8241eff0 SHA-1: 6a14d60f3c3ec63a3c6c8641ac87f4e82356239d SHA-256: 7203a1a0c37ff4d9e1c29c0ff1222d0f0b1e1df055e806700fa901dbb2c84b90
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel document containing an embedded OLE object that triggers CVE-2018-0798, a vulnerability in Microsoft Equation Editor. This exploit allows for arbitrary code execution when the document is opened. No document body text or scripts were present to provide further context on the payload.

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
f524cb730a944504a542e7d34aef83eec74a8328676b0cefb938983b3167fe55		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
708bec98ba68a2922db87dde6e5ccf7708f10fef26f5e3694d6ca43f5980ceaf		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: ole10NAtiVE 1787 bytes

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