Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 ed405158bb992eb5…

MALICIOUS

Office (OOXML)

8.7 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: 2a4289f7642ddc32ef9019a538946f62 SHA-1: 5d19318fbb1374b574cc576e97b456e383072808 SHA-256: ed405158bb992eb55f067abb06b0285451c71e3db6b6910096608180d0c89b71
100 Risk Score

Malware Insights

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

The file contains an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798 due to anomalous native stream data. This suggests the document is designed to exploit this vulnerability to achieve arbitrary code execution upon opening.

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
6c69047bfeafb142f53ba769afe2720ebc81c85308c8b2bfb0302ca74fa69dc5		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
bd59056e898caec52a4d363cb77c7ac5babe1deec69a432cd12af35b96129972		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10NATIVe 1720 bytes

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