Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 13d48960dbce8e70…

MALICIOUS

Office (OOXML)

9.2 KB Created: 2018-08-29 14:23:22 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2019-01-11
MD5: f6c1948cba9eec63fb77dddaa0742a1d SHA-1: a2e26bc5a69b44f4f3bfa551ef8c47eba3a1221a SHA-256: 13d48960dbce8e7046bb2f220f6be4a742cb1e5750fe2f05458a5f252a10dae9
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: 1aa5815c2f75c224fcf9d459ff0b3904655d30e16c0d8073a27c739f9ed93481
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLE10nATive 1886 bytes
SHA-256: 68b6041649325e2c4913f1c296fa39964cdd7db643250333de7fc11295dc4aee

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