Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 18028f38e09ed4e9…

MALICIOUS

Office (OOXML)

14.4 KB Authoring application: Microsoft Excel 12.0000 First seen: 2020-05-25
MD5: 930e9be90621391b09ffb27d0aceff90 SHA-1: a1e78f9c355aa056318d19893194fa81c76c44b0 SHA-256: 18028f38e09ed4e9705e099336dcd2d040de45c6db5627d3c9f2ea148d142db0
100 Risk Score

Malware Insights

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

The file is an OOXML document containing an embedded OLE object identified as a Microsoft Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798 due to an anomalous Equation Editor native stream. This suggests the document is designed to exploit this vulnerability to execute arbitrary code, likely for the purpose of downloading and running a secondary payload. No document body text or scripts were extracted, limiting further analysis of the specific lure or payload.

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 3584 bytes
SHA-256: ee329868bd2c75e5ef63958b2fa6d03592dcc9213f2980e17c59d6530fcf98e1
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLe10NAtIvE 1307 bytes
SHA-256: 1fdf996a7c8fc4237eebf7bb1c96afc4de3a4f4081133a218302467f46a760bb

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