Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 9904029bb7b7e582…

MALICIOUS

Office (OOXML)

15.8 KB Created: 2018-05-08 08:57:10 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2019-04-18
MD5: c47b23063a3dd9b2ee655eaedddccff4 SHA-1: 3ea6d7150451d39d6441d297c802cfeda67554df SHA-256: 9904029bb7b7e5821623c2f3a644048d5e7526315e3befb0a6bc07320c0d18da
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample contains an embedded OLE object identified as an Equation Editor object, which is known to be vulnerable to CVE-2018-0798. This vulnerability allows for arbitrary code execution when the object is accessed. The anomalous native stream and high entropy further indicate a malicious exploit. No specific malware family could be identified, and no further IOCs were extracted.

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 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
SHA-256: 709e6b100340e8e8fb037b06a2f1954a676f78b2af181ae8df3ae54e74db8e51
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10NATivE 1681 bytes
SHA-256: cd38485e380ae9f768ebc77e7d1b8d160c29bdb8d2aa0d5e5f3349d80b82ac3b

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