Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 3ea785317889b681…

MALICIOUS

Office (OOXML)

638.1 KB Created: 2021-07-09 04:27:30 UTC Authoring application: Microsoft Excel 16.0300
MD5: d8127291c3dd6264c8d145b66d9b5241 SHA-1: 9ded4cec9db1aa69e83325be3321ed8ad19964a6 SHA-256: 3ea785317889b6815afe8bbc5465bcff6a0dea8c1bd175fd1c8fe2b2c2bbd73b
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel document containing an embedded OLE object identified as an Equation Editor. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, strongly suggesting it's designed to exploit a vulnerability for client execution. The document body content appears to be a packing list, likely a lure to disguise the malicious embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/eMkE.bMamFcO contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • 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
53615ac770e8db130f2d19ba7254f93cf078da94fd68b2f3b91e6fe9dc1c3783		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/eMkE.bMamFcO 870400 bytes
ooxml_oleobject_00_ole10native_00.bin
b2b6abe683853d4cfc17cd736a23c3bfcde0270628b7aa9f622294ba59ae1876		 ole-package OOXML xl/embeddings/eMkE.bMamFcO Ole10Native stream: OlE10nATivE 861002 bytes

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