Malicious RTF — malware analysis report

Static analysis result for SHA-256 c903784126766e9a…

MALICIOUS

RTF

386.4 KB First seen: 2019-01-12
MD5: 4a0501909df59399acd3b14ec834d571 SHA-1: 6cae044e3410ddeada2463e635ab62bb32ee267a SHA-256: c903784126766e9a245bc02ddb128d12a223e9f109eeedf107d78e7eb6d56049
180 Risk Score

Malware Insights

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

The RTF file contains an OLE object that triggers CVE-2017-11882, a critical vulnerability in Microsoft Equation Editor. This exploit allows for arbitrary code execution, indicating a malicious intent to compromise the user's system. The presence of the exploit and the ClamAV detection strongly suggest this is a weaponized document, likely delivered via spearphishing.

Heuristics 4

  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001430.bin rtf-objdata-decoded RTF \objdata at offset 0x1430 76947 bytes
SHA-256: f6f3e5a7a8c7ecaeb78d8dd82c7a54fed8540118feeff9551baa9b8fdf14cb8d

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