Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 dc5c30dc7183f768…

MALICIOUS

Office (OOXML)

9.2 KB Created: 2018-09-17 07:54:41 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2019-06-27
MD5: 3b250fd54581a4624b254b90d5dbef1b SHA-1: fcf4eae28ddbc37ee607537c9e1fc176a2f1b20b SHA-256: dc5c30dc7183f76862346265e43b2d87002eaa9fabf673f55fc6712c86dabe21
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: 51597e842c1dc30d9812504dbeb7910261920f34a896724c06305b0033b15948
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10NATivE 2098 bytes
SHA-256: 13419a30aa013153f6b411f47c33c36f0f1b33f6a896cc52be9dee94f731f65d

Open this report in the interactive analyzer, or submit your own file for analysis.