Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 d736892c2d575f5c…

MALICIOUS

RTF / .DOC

14.3 KB
MD5: dfdedb6a727ccdea5b78f5a842e2155a SHA-1: 85d22902cf733dba8d906df55c79dbeb6e00c2b7 SHA-256: d736892c2d575f5cd3d249546ca9328873837dd054a2903ce486150dff5c9916
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an RTF document that contains embedded OLE object data, specifically triggering the Equation Editor. Critical and high severity heuristics indicate the exploitation of CVE-2017-11882, which is a known vulnerability allowing for remote code execution. The presence of `EQUATIoN.3` in the heuristics further confirms this attack vector. The document body is heavily obfuscated and does not provide direct clues, but the heuristics strongly suggest the exploitation of this vulnerability for initial 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_off00000848.bin
5abe80ca7d0609a351ced5a98b6d497167213f3a28114542f3648a3fec9adebe		 rtf-objdata-decoded RTF \objdata at offset 0x848 1645 bytes

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