Malicious RTF — malware analysis report

Static analysis result for SHA-256 10ef779276119f5e…

MALICIOUS

RTF

9.3 KB
MD5: 28fbc92abd52bd871cfa322673390621 SHA-1: 7f6644531826c4dfb10d29bf002e961067afe18b SHA-256: 10ef779276119f5e40406b61ef84c14da34494f1f839d1047f65961f053baf2b
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 triggers the CVE-2017-11882 vulnerability. This exploit is known to facilitate the execution of arbitrary code, likely to download and run a secondary payload. The specific ProgID 'EQuATIoN.3' is indicative of 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 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_off000014a9.bin
a1c4a3046065cc9a52cde1b3a8e62ec4362c2628b3586f55e739d0d89c6dec08		 rtf-objdata-decoded RTF \objdata at offset 0x14A9 1518 bytes

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