Malicious RTF — malware analysis report

Static analysis result for SHA-256 600609c16b29938a…

MALICIOUS

RTF

12.7 KB
MD5: efec9e9351dcd9494d3a9c3999bd4066 SHA-1: 74f1ea2f45dbf9205f3845e518438eff88447b0f SHA-256: 600609c16b29938ac70ba2b9dc676b51f69aa6b2125b0d55786fc35772cbc618
200 Risk Score

Malware Insights

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

The RTF file contains evidence of the CVE-2017-11882 vulnerability, which is commonly exploited via specially crafted documents. The presence of `RTF_EQUATION_EDITOR` and `CVE_2017_11882_ACTIVATION_RELATED` heuristics strongly indicates this exploit. The ` tfobjdata` and ` tfobjupdate` directives further confirm the exploitation of OLE objects to trigger the vulnerability. This technique is typically used as an initial vector to download and execute further malicious content.

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.
  • 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.
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001f46.bin
02f7636c4d27ba44a52458b6dbd29080194a6e344466275734bbea2386ec3108		 rtf-objdata-decoded RTF \objdata at offset 0x1F46 1787 bytes

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