Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c8cbe53ba775c170…

MALICIOUS

Office (OOXML)

15.0 KB Created: 1996-10-14 23:33:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2020-08-10
MD5: 0059abb3b6a02bf925a4fbf685e5ee9b SHA-1: df5b22142e2ee389d56f07237c28ac43bb7e5a9a SHA-256: c8cbe53ba775c1702e44dd5347103086896eb950860bdcc02543e300abce1c0d
120 Risk Score

Malware Insights

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

The document contains an embedded OLE object, specifically an Equation Editor object, which is flagged as anomalous and indicative of CVE-2018-0798 exploitation. The document body includes a clear 'ENABLE EDITING' prompt, a common lure to bypass macro security. The presence of the OLE object and the lure strongly suggest the document is designed to exploit this vulnerability for initial 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 4608 bytes
SHA-256: 1b73c33f6c7548fc212c2411051c528af533e9c7b14805a802f56293e4eea256
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10naTiVE 2058 bytes
SHA-256: 155ac88e4d90e16b72a338533f752d1cdbc2261c709e11dd1bdb851564c2ed9d

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