Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 af719445dbb43a23…

MALICIOUS

Office (OOXML)

25.7 KB Created: 2019-07-22 18:46:12 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2020-02-04
MD5: 7901c7e9aca1dc16ff0bd0631fbaaa53 SHA-1: f166d0c7c972e41a41a305159dda341bfaa8e129 SHA-256: af719445dbb43a23251509a6bf0f3dd640e1da70d288038917e238c9af53d789
100 Risk Score

Malware Insights

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

The file is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate a potential exploitation of CVE-2018-0798, a vulnerability associated with the Equation Editor. This suggests the document is designed to exploit this vulnerability to achieve code execution, likely for the purpose of downloading and running a malicious 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: b81a113fa643cad5e9341d872bb1f37b60f9a5f420c6f5bb6380a96e29b53243
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLE10natIVE 1939 bytes
SHA-256: 4e640760306ff78089d8c8cf0f9bece74a51c95997190dbdb2d6ce660b6e7d12

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