Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 9391dfa0a3240a98…

MALICIOUS

RTF / .DOC

318.3 KB Created: 2019-09-17 13:59:00
MD5: 5172ae87415531692b958e2c46dc1187 SHA-1: 9b507e2dad46791a02c9fd0bbb0d0d47f249a8cd SHA-256: 9391dfa0a3240a98f7c4bc31390ecbc2c12a8e48322261c7be7e7347e23a30ce
200 Risk Score

Malware Insights

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

The RTF document contains embedded OLE objects and specifically triggers the Equation Editor CLSID, indicating exploitation of CVE-2017-8759. The ".objupdate" directive forces OLE activation, confirming the exploit's execution path. While no specific second-stage payload URLs were found, the exploit's nature strongly suggests it's a downloader for further malicious activity.

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_off00049d10.bin
33741c4e3532d1db7eda6da4cfbc9841671a17becd85dd375e648815d7844452		 rtf-objdata-decoded RTF \objdata at offset 0x49D10 3739 bytes

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