Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 4cebff73f039c657…

MALICIOUS

Office (OOXML)

14.8 KB Authoring application: Microsoft Excel 12.0000 First seen: 2020-09-07
MD5: 231fe71bd3d74b5265dce3100f3aa58d SHA-1: 6de229509aa5d9ea4631ffccb81c3a44d965d47c SHA-256: 4cebff73f039c657b602143c7e51411f12b982bc470f7160f1abebf01c94dd6c
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: 8b69dd7588e9d6b83fdd350f43baf4812c148383b2eafc986988052ea8c25b5c
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10naTive 1660 bytes
SHA-256: b439c5cd6bf3b0755801ad66edc892183df14202174694c9bd81635609efce25

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