Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 4500c1a5fdb387b6…

MALICIOUS

Office (OOXML)

9.6 KB Created: 2020-01-18 12:09:58 UTC Authoring application: Microsoft Excel 14.0300 First seen: 2020-07-24
MD5: 2cd85b1ef8088aa01c13685368eb1d40 SHA-1: 5cdcfd14f889fab6860e191546b290eef5b7cbbc SHA-256: 4500c1a5fdb387b695ee05f897e868e40f71fde0e78be378db7e28f6c1a7d802
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: 9c6d9ce799e1fff32ecb24b49b814ed39a01200a0924723303244979617540c7
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10natiVE 2002 bytes
SHA-256: c4177cdc171183d311fd02620032e1784235ae24a7cfe576aa45405cd7790b0f

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