Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 4774e8bd1e9446a2…

MALICIOUS

Office (OOXML)

10.4 KB Created: 2021-03-25 05:02:41 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2021-06-17
MD5: ba82baee20982a11f326a8ff6978b799 SHA-1: ac91b60dbbc0afe920b57a54ef3b6b927c6a7f49 SHA-256: 4774e8bd1e9446a2a22f297220f7e131e72ba4f0eb0732873f12f82c12e89252
120 Risk Score

Malware Insights

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

The sample is an OOXML document containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate this object is anomalous and likely exploits CVE-2018-0798. The document body contains a lure instructing the user to enable editing, a common tactic to bypass macro security and execute embedded content. The embedded OLE object is the primary indicator of malicious intent, likely serving as a dropper for a second-stage payload.

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: fad7c777449bc8e966623db2a8de80593d7e69ae12ea2dfd9a52982c48e27cf9
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OlE10NatIVe 2296 bytes
SHA-256: 99da4066e2c3699c4cf12728930cb623aff49c407d1e2fa1cfdfc64ba931037a

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