Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 8d37ffef5368f8ca…

MALICIOUS

Office (OOXML)

9.2 KB Created: 2021-04-28 21:02:36 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2021-05-22
MD5: 17bc07cad9dd81d9ea351c8da3fceffe SHA-1: 9a54928cbd7d7d432f5e5e20426bee2890d1364d SHA-256: 8d37ffef5368f8ca0a4d4bf1f1d3c865f991d07be6d9ae77ae6818e776211d02
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: e5a73d16c592ba1a3809d99e4cb1fa84a031b250308f5a3533ca824c59435cbc
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLE10nATIve 1899 bytes
SHA-256: b88a422f9ee2f3aeb8988e6682dcbb97e29a3ca6b6157fb8c67e7f6ec42e3d7c

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