Malicious RTF — malware analysis report

Static analysis result for SHA-256 fac65eb1ef3ec04b…

MALICIOUS

RTF

75.3 KB First seen: 2018-10-26
MD5: 809b96d75a2de7cb381ac947ded804f3 SHA-1: c9e565a3c674ce09aa4342030f57457994ba990e SHA-256: fac65eb1ef3ec04b30934e6f7e0c86d988c4e6f2acabdda77483627217c0e2ce
260 Risk Score

Malware Insights

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

The RTF file contains critical heuristic firings indicating the exploitation of CVE-2017-11882 through an embedded Equation Editor object. This vulnerability is commonly used to execute arbitrary code, suggesting the file acts as a dropper for a secondary malicious payload. The presence of OLE object data further supports the exploitation vector.

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.Dropper.Agent-6946339-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6946339-0
  • \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 2 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000003a.bin rtf-objdata-decoded RTF \objdata at offset 0x3A 34458 bytes
SHA-256: 8be90bbf68991a685156c9148f4c5010932b284c826f69fe2a4814b5e93c01b6
objdata_01_off0000042e.bin rtf-objdata-decoded RTF \objdata at offset 0x42E 33458 bytes
SHA-256: 8d22f5ecede82891d664b6af8fcd6fc8d5cee984474ceedea53fddae3553970d

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