Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 a8ea1acd4058eec8…

MALICIOUS

Office (OOXML)

46.0 KB Created: 2017-05-10 06:52:46 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2019-05-31
MD5: d5a42ab6418dd7b1a119eb28df7ac00b SHA-1: c493ae5709d374e9ca598667060c6c2f5fe089eb SHA-256: a8ea1acd4058eec86e801054ed61d7e1ce4848096461b85f243bcff0874715e5
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an OOXML file containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798 due to an anomalous Equation Editor native stream. This suggests the file is designed to execute arbitrary code upon opening.

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: 13b3230904918f96fee82e39df51d50696f458dc4e50bfa9ae34db36d5af24fb
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 1886 bytes
SHA-256: d4224e578352cb4da0c2520698701a12c95a94c09714aa1cfd7ba90777723766

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