Malicious Office (OOXML) / .OLE — malware analysis report

Static analysis result for SHA-256 bbb7f497a39ba38e…

MALICIOUS

Office (OOXML) / .OLE

15.0 KB Created: 1996-10-14 23:33:28 UTC Authoring application: Microsoft Excel 15.0300
MD5: 13c8fe3fa821e7196af29e05a478ca60 SHA-1: 97f1df66f51057e160061410ba81b62e209139fa SHA-256: bbb7f497a39ba38e527591f7fed577f648f5832b7dbc36d9305a6e5e4636c015
120 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1559.001 Component Object Model Hijacking

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, an anomaly within the Equation Editor's native stream. The document body contains a lure instructing the user to 'ENABLE EDITING ABOVE', a common tactic to bypass macro security. This suggests the document is designed to exploit this vulnerability via the embedded OLE object once the user is tricked into enabling editing.

Heuristics 4

  • 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
3cef7a35cb4f36d93a9a39849747a030c143bd02d80ea758825bdb207ff3a480		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
e926ff1c8d20e7b5dc603199221dcc89997d80e76eaf3fe765ba68a70f9786bc		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10nativE 1924 bytes

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