Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 e49c90d1c1b5918e…

MALICIOUS

Office (OOXML)

37.5 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2021-05-26
MD5: 8e26710e7ac2c56a6fa52be65aed2274 SHA-1: 34da7e49321b92e75a936734fe7a70e7d8c4cf5c SHA-256: e49c90d1c1b5918e6842bb86e49ce10f714b1650c4b26239720f242c90890f4f
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. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798 due to anomalous native stream data within the OLE object. This vulnerability allows for arbitrary code execution.

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: 1835fd02e9e50c4dd89b9be582776b1b93275ce53843e929e2f2788bd55c5ce9
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10nAtIve 1768 bytes
SHA-256: 8064897632b30c438979ef5de028d7a8399463e41fca020a4422255e80af4119

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