Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 10df15707ce5a8b4…

MALICIOUS

RTF / .DOC

102.1 KB
MD5: 9095b4b704c9f1ef75cc683b57e1f207 SHA-1: d88b99fc3fff5eac59d7fedd136fd467f1c17106 SHA-256: 10df15707ce5a8b457ebccab5f4a5c3b2548ea755bc11666f5601583677f17b5
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF document contains embedded OLE object data, specifically triggering heuristics related to Equation Editor and CVE-2017-11882. This indicates the file is designed to exploit a vulnerability in the Equation Editor component to achieve code execution.

Heuristics 5

  • Obfuscated Equation Editor ProgID + activation critical CVE related RTF_EQUATION_EDITOR
    RTF decodes to an Equation.3 ProgID from top-level \objdata hex after nested RTF junk groups are ignored, and the document also contains \objemb plus \objupdate activation. This is an obfuscated Equation Editor exploit surface associated with CVE-2017-11882 / CVE-2018-0802 families, but no exact malformed MTEF CVE primitive was recovered from this object.
  • 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.
  • \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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000295.bin
c4fa0a8a6378c157391292de1e0455ab47cd1ecec8b6184d2f756bad385c1cc9		 rtf-objdata-decoded RTF \objdata at offset 0x295 26883 bytes

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