Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 13d273df0f7efc91…

MALICIOUS

RTF / .DOC

1.68 MB
MD5: 6a020b76367ad29007aedca5ac88c4fd SHA-1: 3c571cf962e47815a52770955bfe35cd4fbacf9b SHA-256: 13d273df0f7efc91ce7cf21fe7d7654b1895dd9d5a4026831a781c80bf8dfde4
260 Risk Score

Malware Insights

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

The sample is an RTF document containing OLE object data, specifically related to Equation Editor. Critical heuristics indicate the exploitation of CVE-2017-11882, which is known to deliver a secondary payload. The presence of a large, hex-encoded OLE object further supports the likelihood of a hidden executable. No document body text or scripts were extracted, but the RTF structure and heuristics strongly suggest an exploit delivery mechanism.

Heuristics 6

  • Equation Editor OLE1 native payload — CVE-2017-11882 related critical CVE related CVE_2017_11882_RELATED
    RTF decodes to an OLE1 Equation.3 embedded object whose native data is large and payload-like, and \objupdate requests automatic activation. This is the delivery shape used by Equation Editor RCE documents such as CVE-2017-11882/CVE-2018-0802, but the malformed MTEF record needed for exact attribution was not recovered.
  • Split hex Equation Editor ProgID + OLE object critical 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.
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \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.
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~1756KB of hex-encoded data inside \objdata sections — may hide a payload
  • OLE object data medium RTF_OBJDATA
    RTF contains 2 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001967.bin
498341a8e14809d0637c6092f425f0617d98c4abbe0497030326b8f1af06e91e		 rtf-objdata-decoded RTF \objdata at offset 0x1967 878403 bytes

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