Malicious RTF — malware analysis report

Static analysis result for SHA-256 fe3f0f2ede09af94…

MALICIOUS

RTF

121.0 KB Created: 2011-01-24 12:11:00 First seen: 2018-11-13
MD5: 529017859f702cacdf53ffe74f1735f9 SHA-1: 720071a7affac2ba3491fa1e49a258618baf9821 SHA-256: fe3f0f2ede09af94f852f9638451e02c0d8005f947a27e0dc026defdec82fd24
260 Risk Score

Malware Insights

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

The RTF document contains embedded OLE objects, specifically leveraging a split hex Equation Editor ProgID and ".objupdate" directive to trigger exploitation of CVE-2017-8759. This vulnerability allows for the execution of arbitrary code, likely a second-stage payload, by exploiting MSXML SAX OLE activation. The document body appears to be a resume, suggesting a spearphishing attachment vector.

Heuristics 6

  • Split hex Equation Editor ProgID + OLE object critical CVE likely RTF_EQUATION_EDITOR
    RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
  • 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.
  • PE header (with DOS stub) in hex data critical RTF_MZ_HEX
    Hex-encoded PE (MZ + DOS stub) found inside RTF — likely an embedded executable payload
  • \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 2 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000e03b.bin rtf-objdata-decoded RTF \objdata at offset 0xE03B 22612 bytes
SHA-256: b9bf97c8ffd39331b1128d2a80e72651408630ab99e5041e4130daa54c5f26b0
objdata_01_off00019134.bin rtf-objdata-decoded RTF \objdata at offset 0x19134 10550 bytes
SHA-256: 4bab0684702186c84f919a8c9d5b817bbe2148a88275d24cf8298b09b031a3f0

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