Malicious Office (OOXML) / .OLE — malware analysis report

Static analysis result for SHA-256 515c5083c3d4b626…

MALICIOUS

Office (OOXML) / .OLE

22.1 KB Created: 2019-01-11 10:54:01 UTC Authoring application: Microsoft Excel 12.0000
MD5: 20c293b1d55a32733a1847f5f7a24e2a SHA-1: 5d6bfa2254a7ce0c905a68d3e2232dde5d4be60e SHA-256: 515c5083c3d4b6262d4d50da0906548a37db131cc114a9a7e86474764f85b989
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The sample contains an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate that this object is anomalous and exploits CVE-2018-0798. This suggests the document is designed to leverage this vulnerability for arbitrary code execution upon opening. No document body text or scripts were extracted, but the presence of the vulnerable OLE object is sufficient evidence for this assessment.

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
56bb375f94deef63fd25ca5035fc30fde9e75160263f9d4552a8349fa19fea72		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
7dae018b70a5f005612f145d4c10822f7fc2f5af6365abf63683f3655f0f9112		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10nATIve 1723 bytes

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