Malicious RTF — malware analysis report

Static analysis result for SHA-256 d917992a0ed5dd65…

MALICIOUS

RTF

8.3 KB First seen: 2019-08-04
MD5: a610bb5d55ab4ed55ec2fc1126d2ba6f SHA-1: 39a2e6f1827067a81a20bc0e8474af1f2fba4dd7 SHA-256: d917992a0ed5dd658bff8e0a384c8522aee47ee9ef4f6ab58616ed2dd1bbf4e8
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE object data and specifically triggers heuristics for CVE-2017-11882, indicating exploitation of the Equation Editor vulnerability. This vulnerability allows for arbitrary code execution, likely as part of a spearphishing attachment campaign.

Heuristics 4

  • Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882
    Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
  • \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_off00000032.bin rtf-objdata-decoded RTF \objdata at offset 0x32 4148 bytes
SHA-256: 065b442cd5f2c33a9b94b91c823d4d821d82ad8e02f4d0b67588fbe13f28a223

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