Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 4fdf2ab9302d8eb1…

MALICIOUS

RTF / .DOC

393.7 KB Created: 2019-09-17 13:59:00
MD5: 38dee6d5471c99e1cea3ab5470685f83 SHA-1: 9a35e6ea195e691b9f42b2d153494d1fe16450f5 SHA-256: 4fdf2ab9302d8eb10903a5c535e688941be99ec4130ba4fe670ae3ca84fa9d94
200 Risk Score

Malware Insights

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

The critical heuristic firings for RTF_EQUATION_EDITOR and CVE_2017_8759 strongly indicate exploitation of the Equation Editor vulnerability (CVE-2017-8759). The presence of OLE object data and the ".objupdate" directive further support the mechanism of OLE activation for code execution. While no specific second-stage payload URLs were extracted, the exploitation pattern suggests the intent is to download and run additional malicious code.

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_off0005b1d4.bin
d20911be63b21e02fd944fb43a9409b2d2770ab8dde313835bb01f1c3825e748		 rtf-objdata-decoded RTF \objdata at offset 0x5B1D4 3739 bytes

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