Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 16fe314727d342eb…

MALICIOUS

Office (OOXML)

12.4 KB Created: 2018-03-14 13:56:47 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2020-07-24
MD5: 0cf573c7ae83214fb87cd4ef534f05a2 SHA-1: 66547e80820d18deba9fdb74e465009a774ffc56 SHA-256: 16fe314727d342eb6aaa03428195f5b41eb078905c297e5f0528ec9cead9a1e6
100 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. High-severity heuristics indicate the presence of CVE-2018-0798, a vulnerability associated with anomalous Equation Editor native streams. This suggests the document is designed to exploit this vulnerability to achieve arbitrary code execution upon opening.

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 4096 bytes
SHA-256: 1a5c77b49f1326e7784b3ff26a69c4a5ea33df8ecee72760a942eadca28e957f
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10NatIVe 1915 bytes
SHA-256: 6e5c819eb46a03d58d89a00bd76f3694cb123d6eea86df5bbb38b4ef02dbef75

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