Malicious RTF — malware analysis report

Static analysis result for SHA-256 aadcb4afd506c366…

MALICIOUS

RTF

8.2 KB First seen: 2019-03-18
MD5: 5d9c6928d836c9aa1f03229e5df44333 SHA-1: f26e60d72d762523cdf8f064306e963abab19f6d SHA-256: aadcb4afd506c366b62ef39ae157ebfbe5dde70725e13efe814c39143b499965
260 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains embedded OLE object data, specifically triggering the CVE-2017-11882 vulnerability via Microsoft Equation Editor. This exploit allows for arbitrary code execution, indicating a malicious intent to compromise the user's system. No specific malware family could be identified from the available evidence.

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_off0000003a.bin rtf-objdata-decoded RTF \objdata at offset 0x3A 4155 bytes
SHA-256: 477a5ff2dc646d4b956e9d09cb83b91c8b96b7aa4018d83a30051de23977cca7