Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 a359740dfcb0646b…

MALICIOUS

Office (OOXML)

559.2 KB First seen: 2019-08-04
MD5: 55437c8f5d7bfb2db3dc1e6887ccf5d5 SHA-1: 0176f716cc2af3203f8e49a421dc3757fcb601a5 SHA-256: a359740dfcb0646b5b925350201f59e7df73e9570c84eb1f5daabc2e63aad052
100 Risk Score

Malware Insights

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

The sample contains an embedded OLE object identified as a Microsoft Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798, which allows for arbitrary code execution. This is a common technique for delivering malicious payloads via spearphishing attachments.

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: 730f15b7c96debf37d1c42b63c5c8dddcc424fb130d13f057a321740c894ba47
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 1577 bytes
SHA-256: d7ba43426a02d2d020d80f0d0c1b662fbbf0829c65de6954d6cd84548673bba7

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