Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 825ae62ca28dbd52…

MALICIOUS

RTF / .DOC

11.1 KB
MD5: 9bf83755a425cdee08314685215a5d53 SHA-1: d72b79db6ce6416fd631fa50d6dc7a55534940f4 SHA-256: 825ae62ca28dbd523675996f259ef4876369fb54029f950bc2660ccfb975f0b7
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF document contains heuristics indicating the exploitation of CVE-2017-11882 through an embedded Equation Editor object. The presence of RTF_EQUATION_EDITOR and CVE_2017_11882_ACTIVATION_RELATED heuristics strongly suggests this vulnerability is being leveraged. The embedded OLE object data and the use of \objupdate further confirm the attempt to activate the exploit. The specific class 'eqUatiOn.3' is noted as part of the exploit mechanism.

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_off00001c33.bin
9ead8f7e78db268a1bb8db909fb9da7f2249caccf81ad3e2d49a18e5f39d5168		 rtf-objdata-decoded RTF \objdata at offset 0x1C33 1534 bytes

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