Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 3e270dfe8e2f4561…

MALICIOUS

RTF / .DOC

1.39 MB
MD5: 34dc53a99c31fa46571a5ed4ce401299 SHA-1: 91ef7139faa3228ee3e8b10c56f38e26285cad00 SHA-256: 3e270dfe8e2f4561ffa79fe24e3d935f453653866faf9a3d8c88231692f153d1
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains embedded OLE objects, specifically triggering the CVE-2017-11882 vulnerability related to Equation Editor. This exploit is known to allow for arbitrary code execution when the embedded object is activated. No further stages or specific IOCs were extracted from this sample.

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_off000011e1.bin
805850740f47a2ef47786881b8e31d56c0c5c72f83e3885028f36936a4542b3a		 rtf-objdata-decoded RTF \objdata at offset 0x11E1 53349 bytes
objdata_01_off0002ed1b.bin
5d913e0bdd4543b59117490fda1dba3c38edbcd2b81c5376d07402a696f7c2ab		 rtf-objdata-decoded RTF \objdata at offset 0x2ED1B 346025 bytes

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