Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 f918c269abc475fd…

MALICIOUS

Office (OOXML)

62.7 KB Created: 2017-01-31 07:23:40 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2019-10-01
MD5: 1b609990704f14011436df84255799c7 SHA-1: 228e7fc808a9ad212e3e26f70c93753de75faece SHA-256: f918c269abc475fd5453c1de1b26d905aaf6adf89f288fa94ff346fa38082701
110 Risk Score

Malware Insights

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

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, which allows for arbitrary code execution. The presence of external hyperlinks suggests a potential delivery mechanism for a secondary payload.

Heuristics 5

  • 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
  • External hyperlinks (1) low OOXML_EXTERNAL_HYPERLINKS
    Document contains 1 external hyperlink — clickable URLs are stored as external relationships. First target: http://www.ggl.co.kr/
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.ggl.co.kr Document hyperlink
    • http://www.ggl.co.kr/Document hyperlink

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: febd1a15559260fc122696f3a0359b82306799077267e06fb3ca2a840e310aeb
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 1946 bytes
SHA-256: 23bcfb62c688a71b88213f4cdd7070ac326d48c4021b7131d81bac186f0198e9

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