Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 616cb5cc22541d8a…

MALICIOUS

Office (OOXML)

9.2 KB Created: 2018-09-17 07:54:41 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2019-01-12
MD5: 218d4a50a63a38813b3b7f0f5d67923d SHA-1: 9196718334bbafab41ce94cde142aa31882d2f77 SHA-256: 616cb5cc22541d8a210ee254b3859bffe5aee576e8b45dbce57e5fb862a10d96
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 4608 bytes
SHA-256: 3b57165cdb7fd75d57ff3a61e464d3f84f49d3570399c82cc9a6584d2326168e
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: ole10nAtIvE 2087 bytes
SHA-256: 562b46579eaebfcfc77bbb619c825105526e97f18d788b3b1d12492cf1a5a825

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