Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 b2c2bc401bd34c65…

MALICIOUS

Office (OOXML)

19.8 KB First seen: 2019-01-11
MD5: 242553e2a325036d45a5fade890cc7ec SHA-1: c3a66c40abc1b447700431672d6e7cdd86dd1410 SHA-256: b2c2bc401bd34c656c5c2c4af715ce0ea4a983ba5ad3e5d420ba13d0d8dba36e
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: 957be263d75a038a54a4a5f0cdf408c49498e1cd47d2074e183e815bdf5d2085
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLE10NaTive 1565 bytes
SHA-256: 3293b24e24a75e78d7f3eacfa525d163ff784f0fb5f37fc299291dbf52439264

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