Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 cb37ad1c51e5a5e2…

MALICIOUS

Office (OOXML)

12.5 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300 First seen: 2020-08-25
MD5: 95353a8de54fdc6719b748e577432008 SHA-1: 6fd136c5ca8fd269b58b81e47a9af69b2759e51a SHA-256: cb37ad1c51e5a5e29287c2b0bd85ddb3bce24588ef8791aed8646fca417aafe2
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an OOXML document containing an embedded OLE object, specifically an Equation Editor object. High-severity heuristics indicate the presence of CVE-2018-0798, an exploit targeting the Equation Editor. This exploit allows for the execution of arbitrary code, likely to download and run a secondary payload.

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: 9f586ffff62d3528aa29527b52245729d2ace09299d02339da1dc09b4cb8c584
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10NATIVe 1803 bytes
SHA-256: 43ba4b556220575ce3d17574fe4ec859bd3ca63ed3a5919428492e08be3cb0e9

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