Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 bdb8d17677ce0304…

MALICIOUS

Office (OOXML)

18.3 KB Created: 2020-01-08 16:45:10 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2021-06-04
MD5: 49e009f066425643dee6b6bae6ec87b8 SHA-1: 87d71ee389f50f2dfb7b258d994d8fedf37d52b1 SHA-256: bdb8d17677ce03048c3f278f9843a55345ccaa53d2ad2e7bda9cca2ac75d9043
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is an Office document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate the presence of CVE-2018-0798, a vulnerability associated with Equation Editor. This suggests the document is designed to exploit this vulnerability to achieve code execution, likely for downloading and running a secondary malicious 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: e19ac85684ef7aaf604d706e594c8e0f9280077328832f2ff8d6b2f6cf5828cf
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10NATive 1684 bytes
SHA-256: 35f2c5524ad973eec94e564423183cc5501075f78ad803256c5b296ac96f8637

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