Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 0aca191b6caf88cc…

MALICIOUS

Office (OOXML)

10.0 KB Created: 2019-06-03 06:11:20 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2019-11-20
MD5: 8062811fd7cf2d51b73dda6e775e8bca SHA-1: e526a132460936438ed9349aa2afc03a216b278f SHA-256: 0aca191b6caf88cca80d8ee4b70b9c39de8dd2a26d5830654da2ef69f3129448
120 Risk Score

Malware Insights

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

The sample is an Office document that contains an embedded Equation Editor OLE object, which is known to be vulnerable to CVE-2018-0798. The document body contains a lure instructing the user to enable editing, indicating an attempt to bypass macro security settings and execute malicious content. The presence of the Equation Editor OLE object and the lure strongly suggest exploitation for client execution.

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 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
SHA-256: 0d54aab66b45b4f16cf54468a79db624ebd35f85efb1b8d27517a437aa3eb042
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10NaTivE 1847 bytes
SHA-256: 6ae8af9861f341e8155cb1f6a48d85b599bfe0e60ad086de9b987bb1cfb0b6f6

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