Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 8dae252dbadcd2c7…

MALICIOUS

RTF / .DOC

2.21 MB
MD5: bc4a0e5e31564d5c29a383c86ce7491a SHA-1: d51da2fbd7cb30f416b4e1ec5b9265b348f7e65a SHA-256: 8dae252dbadcd2c72e1deb756fe77dade2f53304a30751b1ee39b83ed940ddc2
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1027 Obfuscated Files or Information

The RTF document contains embedded OLE objects, specifically triggering critical heuristics related to Equation Editor and CVE-2017-11882. The presence of ".objdata" and ".objupdate" sections strongly indicates an attempt to exploit this vulnerability for code execution. No scripts were extracted, and no document body was available for further analysis.

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
688d7a94cb9dc6b9f9693b0d23d5a386c75d4c201c62473118ba0cb14e6a021f		 rtf-objdata-decoded RTF \objdata at offset 0x1202 27192 bytes
objdata_01_off0001ca31.bin
1a9daf7f5259077ae9a7fba5e35fb7f5d70b6d43574b5a4ed8dc4e9c9ad184d1		 rtf-objdata-decoded RTF \objdata at offset 0x1CA31 475057 bytes

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