Malicious RTF — malware analysis report

Static analysis result for SHA-256 cf9858a3e8fc0b02…

MALICIOUS

RTF

13.7 KB First seen: 2018-10-07
MD5: 17259b0a9bfa501c0d229dcc56e949dc SHA-1: b3f45c811672624a2d693aec319c0ea5c2cdd989 SHA-256: cf9858a3e8fc0b025633571e3eaf0f2f227aa0fa346fc1acff33962a838cc6ea
260 Risk Score

Malware Insights

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

The RTF document contains an embedded OLE object that exploits the Equation Editor vulnerability (CVE-2017-11882). This exploit allows for arbitrary code execution when the document is opened. The presence of the Equation Editor CLSID and the specific CVE firing strongly indicate this exploit vector. No document body text or scripts were extracted, limiting further analysis of the payload.

Heuristics 6

  • 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.
  • ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Exploit.CVE_2017_11882-6934206-0
  • \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
  • 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_off00000692.bin rtf-objdata-decoded RTF \objdata at offset 0x692 5942 bytes
SHA-256: fa79379e2967714e0fdfc94f9f7a282f8909d898b86a8b07664f7e34ba185fb0

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