Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 a7b1d24c98235cf3…

MALICIOUS

Office (OOXML)

562.2 KB First seen: 2019-04-18
MD5: 67c475072bbba7d1914e1c4ed9082641 SHA-1: 30ba3997783921eece214ed20cb94cb686117ab3 SHA-256: a7b1d24c98235cf33032cb71b208ea825e304a1c32c4ed8392035f4716d62bb5
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/oleObject2.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject2.bin 4608 bytes
SHA-256: 64acb8847b54370b054c36ef9d855d0145a6a8f5fad98129076b87c6c20c6806
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject2.bin Ole10Native stream: Ole10Native 2269 bytes
SHA-256: 4c4b2ae4a92e4cdf15ddbd96ee52926c7aa4adfa91c16ea912a73ef18ba8c6e4
ooxml_oleobject_01.bin ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
SHA-256: 98ccf44217bb3a9c5a1e8d19862646612842e9794ba8a10345f8797712a22888
ooxml_oleobject_01_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 1925 bytes
SHA-256: a73661f7bd1d70fb18a4b03ee4142fba3aa5d9dc75fd4ba793702cf3cbcb30a0

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