Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 71f88db2b87ac038…

MALICIOUS

Office (OOXML)

18.0 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2020-02-04
MD5: 099558a91d1c6ab4c918a6980582e39a SHA-1: e2d5fdb0537b4afb5b452af904086f9efec6a123 SHA-256: 71f88db2b87ac03829bf377c7f7974a09fa82428e1b24d1f42982c3928207785
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Office document containing an embedded OLE object, specifically an Equation Editor object. High-severity heuristics indicate the exploitation of CVE-2018-0798, which allows for arbitrary code execution. The document body appears to be a logistics manifest, likely a lure to entice the user to open the malicious content.

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: 260f02f421f6adab9a7ad9fcb104dbfc9af301eb451d275f4d6cadbba2f553f5
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLe10NatIvE 1749 bytes
SHA-256: 41d55c69f3c59450effdbcb2eef95afc3f9fc3203887dc32ab67c30927657935

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