Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 c3eda6fb97c55a5a…

MALICIOUS

RTF / .DOC

4.9 KB First seen: 2022-10-31
MD5: 2092aa92b794849ed536ede64f86f712 SHA-1: 5b1c3c65912a8968229bfc3c6f5e94ce80eb5d48 SHA-256: c3eda6fb97c55a5a8da7485e761aec769be3b348dafbeb6b4810cd64b944e3a0
120 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an RTF document containing OLE object data, specifically triggering heuristics related to the Equation Editor vulnerability (CVE-2017-11882). The ".objupdate" directive indicates that the embedded OLE object is designed to be activated automatically, leading to the execution of malicious code. This is a common delivery mechanism for exploiting the Equation Editor vulnerability to download and execute further stages.

Heuristics 3

  • 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 1 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000003b.bin
35d5f6c914b767a725fb166f9c4ac4ceb0909204b7b91d8d439856eea31ebbea		 rtf-objdata-decoded RTF \objdata at offset 0x3B 2495 bytes

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