Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c1d0c85b48bacd38…

MALICIOUS

Office (OOXML)

10.1 KB Created: 2019-06-03 06:11:20 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2019-08-04
MD5: adc3a2ad43a62d33cad5157f0fa452ce SHA-1: 1c6ce613fd29f26898464e9a76b354fbabb0b546 SHA-256: c1d0c85b48bacd387077a5cb2936223e255c3897f5544b9c872a0a5af76b339d
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: e2cfd3fc96b68f9fffcc564b54bf5b5175ba746d8c8efb9d8e42b05e1f4cfd26
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 2012 bytes
SHA-256: 7a58052d586f3aa6e256f102b0296b4eccebcdd5e530168e68ce6c4f1e122d9c

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