Malicious RTF — malware analysis report

Static analysis result for SHA-256 49d542a526726d12…

MALICIOUS

RTF

2.09 MB
MD5: 11309363b89510aec3d401f9bc5be0b5 SHA-1: 23cbb35f319204efe83f75f81554fdcf335d0093 SHA-256: 49d542a526726d12fde02aa1fc69037c3effbb6ff55a05b9481f65882cd89d30
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF document contains multiple indicators of exploitation for CVE-2017-11882, specifically through the Equation Editor object. The embedded OLE object data, when decoded, likely contains and executes a malicious script. This script is designed to exploit the Equation Editor vulnerability for initial execution, leading to further malicious activity on the system.

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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001202.bin
f94673fe8c86fa310cf0162a550eef9417205fd37f9c42a538c1f4c6bb225062		 rtf-objdata-decoded RTF \objdata at offset 0x1202 27088 bytes
objdata_01_off0001c961.bin
429bacded7edaf4f52beb6e14501bf642eb904f4217e5198804a87eb12fc3b11		 rtf-objdata-decoded RTF \objdata at offset 0x1C961 364079 bytes

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