Malicious RTF — malware analysis report

Static analysis result for SHA-256 e7779ad262a7846d…

MALICIOUS

RTF

9.8 KB First seen: 2022-05-02
MD5: 44fddfdabf3e70600c2b7e2314de2d8f SHA-1: 75a53f8fc2ba4c99b41af3fce299f35e44544ccd SHA-256: e7779ad262a7846d220736099328f56bd699a320b0643901e0b94b48ec01bd88
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF document contains embedded OLE object data, specifically related to Microsoft Equation Editor. Heuristics indicate the exploitation of CVE-2017-11882, a known vulnerability in Equation Editor, which allows for arbitrary code execution. The presence of the 'eQUatION.3' class further supports this attack vector. No scripts were extracted, and the document body was heavily obfuscated, but the core attack relies on the Equation Editor vulnerability.

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_off000016d0.bin
ab2873d8276b017b13e18fab89aa027eb4d05288239af1ab1eb480ad78eb5d63		 rtf-objdata-decoded RTF \objdata at offset 0x16D0 1265 bytes

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