Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 d9f57274154a2895…

MALICIOUS

Office (OOXML)

559.8 KB First seen: 2019-05-31
MD5: 11524327b2d7c9bc44140f4e38ed6fc1 SHA-1: 60165e48bd781f0d8d8e25dbd8e20296a8f6b2f5 SHA-256: d9f57274154a28953847e0b07765868c48be382f93076f3856bb4ece415708d7
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: ab63d79286690c65760e39818275d4176eaeb924fa2d008e86610bff96f46705
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 2283 bytes
SHA-256: 901e28b900ee1ec9f0c0c623a9567e826ce54b4a406b4de2c21605c64e15ec3f

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