Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 f0662be14ad23aa2…

MALICIOUS

Office (OOXML)

15.0 KB Authoring application: Microsoft Excel 12.0000 First seen: 2020-09-07
MD5: ce81f8964103431ec2832fc54536a71e SHA-1: 0e3176e893a3f01d5fb04243aa241af635b7941c SHA-256: f0662be14ad23aa2643fa742e6d392bb8dd219f810d59eb961cd563aa7d82738
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 4096 bytes
SHA-256: 994d6bb4583638dd1cecb5aed24c3af2777fdedd2f7cefcbec008ac41f73ea53
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLe10native 2033 bytes
SHA-256: 1fc17d18985d73d61ecdf5c7a43105e21e0b9166b3b664c75e3f975de81502b9

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