Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 6f57ee15068d80ca…

MALICIOUS

RTF / .DOC

11.4 KB
MD5: d030f9e32504a616e729d68603e82db5 SHA-1: 9581cf6b69168e7c992c4f91297b6141456952a0 SHA-256: 6f57ee15068d80cac6a691f8bf283ba99be3cc9c565959df2ca6666ebd67ad44
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 the Equation Editor vulnerability (CVE-2017-11882). This vulnerability allows for the execution of arbitrary code when the object is activated, likely through a ".objupdate" directive. The presence of the "EQUatiON.3" ProgID strongly indicates this exploit.

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 2 \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_off000015fe.bin
7da5679765e2a3eae939a7b63eac4723b92d76fc804ee0e892852055df78f81e		 rtf-objdata-decoded RTF \objdata at offset 0x15FE 1439 bytes

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