Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 feb20487002f915d…

MALICIOUS

Office (OOXML)

19.8 KB First seen: 2019-10-01
MD5: 5ae0a430cb972cfcad915d712831c86a SHA-1: b72a85c68dd72d28760c9e780d3d860679838c22 SHA-256: feb20487002f915d599c0b3061d8b1dc5e74e4dd99b83d2e60c896a63786dbb5
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 3584 bytes
SHA-256: 723fd02be9483a0bfeeaf78e869b8138a0e14e1331cdc3deeb70379adc15d845
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLE10natiVe 1513 bytes
SHA-256: cbf6e562b3cf5e16ff124d5057f74adabfc0da0952f114e61c9cb3cb105575d9

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