Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 99cc9ac3476c16df…

MALICIOUS

Office (OOXML)

27.5 KB First seen: 2019-04-18
MD5: 399790b5e598db35f16b5af48728bcf4 SHA-1: 51cbc19c886a93921d860ec6ce21c3bbdf7a26e0 SHA-256: 99cc9ac3476c16df6da25fce38b33867ddebf1957da726b17b60eaed7a35e304
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: f9e6b0c8ed11aa8fde7e390f82dfdf397856c15dcd1e75cd914cc3f2ef3e1a98
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/EMBEddings/oLeOBJect1.bin Ole10Native stream: OLe10nAtIvE 1785 bytes
SHA-256: c5af2ec2c91f53caca3528d3ea27e063d3930f389c29bbdc6cd5af4e0e226e93

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