Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 209cb1b35516df3c…

MALICIOUS

Office (OOXML)

9.6 KB Created: 2018-09-12 21:32:28 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2019-08-04
MD5: c9a13b04284802a9f0b2a07fe887b31d SHA-1: 9fe259ed1788d20e27b59377f0572fb02150abe2 SHA-256: 209cb1b35516df3c5ded4352b3324529ccb8d423567a4e509b6378e2243dc808
100 Risk Score

Malware Insights

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

The sample contains an embedded OLE object identified as a Microsoft Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798, which allows for arbitrary code execution. This is a common technique for delivering malicious payloads via spearphishing attachments.

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 5120 bytes
SHA-256: c145e25d0d0aab028f0c9b5c14bb848808a1bc64cb49b54c0111098924beb852
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OlE10nATIVe 2628 bytes
SHA-256: 7a6e7c8444dc536d4e14bcf4536c3796bf13d22c9fcf0d27e8a9ae8610923204

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