Malicious RTF — malware analysis report

Static analysis result for SHA-256 727e1f0aabc7d8fb…

MALICIOUS

RTF

6.5 KB
MD5: a1c7bcee0f0c60bc257f59790e383e55 SHA-1: 1577fabaebaaa0d31f94c82cef50dd475bf5459e SHA-256: 727e1f0aabc7d8fb68f756541bd8797dd810c2b3ab684ae6e53732e461425f20
180 Risk Score

Malware Insights

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

The RTF document contains an embedded OLE object that exploits CVE-2017-11882, a known vulnerability in Microsoft Equation Editor. The presence of \objupdate and \objdata sections, along with the specific ProgID 'EqUatIoN.3', strongly indicates this exploit is intended to achieve code execution. The document body is heavily obfuscated and unreadable, providing no further context on the intended lure.

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_off0000071e.bin
261aebc0a0156cba2e2851dba08868b6da39cd966fc66824bc554e39edc74490		 rtf-objdata-decoded RTF \objdata at offset 0x71E 1746 bytes

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