Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 359a6a7051638fa3…

MALICIOUS

RTF / .DOC

1.42 MB Created: 2019-09-17 13:59:00
MD5: 4f05235f684cd5a462dff6fcb479d4ee SHA-1: 2d6ca2657ec4c53b07a17cc7635907c0c0cf52d4 SHA-256: 359a6a7051638fa30be3fc1cfddd95f32fdc4244e14053f9366533d8ff135a1d
200 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.001 PowerShell

The sample is an RTF document containing an embedded OLE object, specifically triggering the CVE-2017-8759 vulnerability related to Microsoft XML Core Services. This indicates an attempt to exploit a known vulnerability for code execution. The presence of RTF_EQUATION_EDITOR and RTF_OBJUPDATE heuristics further supports the exploitation of the Equation Editor component. No specific malware family could be identified, but the exploitation vector is clear.

Heuristics 6

  • CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759
    RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
  • Equation Editor CLSID critical RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • \objupdate forces OLE activation high RTF_OBJUPDATE
    RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.microsoft.com/office/word/2003/wordml

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off001583d0.bin
c44a2ee1ddbff508724a8d91330f0dc2899207316dbad498816ec08398e7b373		 rtf-objdata-decoded RTF \objdata at offset 0x1583D0 3732 bytes

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