Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 34668f483a39a846…

MALICIOUS

Office (OOXML)

8.8 KB Created: 2020-06-21 19:35:20 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2020-09-07
MD5: de9a85b6fde375dce979c24cfa554d7a SHA-1: 4491bb012545cc1eec95c22be97005a37916bd55 SHA-256: 34668f483a39a84694cec8d502d54f7583256765650b890f28ba21cff567a72d
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: 8e2647696b7fe168295df35b9a91b69ca9ba30e6db0a740a9bd4853d40e0f932
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: ole10NAtiVE 1771 bytes
SHA-256: 7d0147ec334cfda2fbd237edfc02cbcf7bebcff18569f7cfcb8de63649dcce0b

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