Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 c3eba54536ed8ec3…

MALICIOUS

RTF / .DOC

524.7 KB Created: 2019-09-17 13:59:00
MD5: dda9dd81a810e4541b2ee1dce1369004 SHA-1: 0c743efd39cdef3e36e573a4bb33f6b862c31031 SHA-256: c3eba54536ed8ec3fb3090c3a12d7044606e1ec03bb2419190bd95819a72562d
200 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.001 PowerShell T1105 Ingress Tool Transfer

The sample is an RTF document containing an embedded OLE object, specifically targeting the Equation Editor. Critical heuristics indicate exploitation of CVE-2017-8759, a known vulnerability allowing for arbitrary code execution. This suggests the document is designed to exploit this vulnerability to download and execute a secondary payload.

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_off0007d5e5.bin
cbec296b89e0e748dfc7759b4dd209b0bff36317f301d0f86befd9c80cc65aa7		 rtf-objdata-decoded RTF \objdata at offset 0x7D5E5 3739 bytes

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