Malicious RTF — malware analysis report

Static analysis result for SHA-256 fbad572e61544a5d…

MALICIOUS

RTF

14.0 KB
MD5: c774c3df375b0d8ad7cb452595ce6df6 SHA-1: 4322dd5d4c44ecaffdc31a761a7493fc045d074f SHA-256: fbad572e61544a5d6c132e233f6fedcff90d5426f874bb703de0922e53c5f2ea
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell

The RTF file contains an embedded OLE object that is activated via \objupdate, triggering CVE-2017-11882. This exploit is known to allow for arbitrary code execution. The specific class 'EQUAtIOn.3' is a strong indicator of this vulnerability being leveraged. No document body text was available for further contextual analysis.

Heuristics 5

  • Equation Editor activation — CVE-2017-11882 related high CVE related CVE_2017_11882_ACTIVATION_RELATED
    RTF decodes to an Equation.3 ProgID and requests OLE activation with \objemb plus \objupdate. This reaches the legacy Equation Editor attack surface used by CVE-2017-11882/CVE-2018-0802 documents, but the malformed MTEF/native payload needed for stronger 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.
  • \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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001e64.bin
09498b88b1c6d73cca255d79db201e5616fe4c49323385bc7f33239de1a9ade2		 rtf-objdata-decoded RTF \objdata at offset 0x1E64 1679 bytes

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