Malicious RTF — malware analysis report

Static analysis result for SHA-256 b3b63da93bbadc2e…

MALICIOUS

RTF

9.2 KB First seen: 2019-05-31
MD5: cb038a284d97fe58f1cad6de2620e55a SHA-1: 93bf511130d8e604215339372c600f572719aa16 SHA-256: b3b63da93bbadc2ec93fbf9082eb0b1505f3359df80742f2370e2932446bc3c0
240 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 exploit allows for arbitrary code execution, likely as part of a phishing campaign where this document is attached. No specific family could be identified.

Heuristics 5

  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000003c.bin rtf-objdata-decoded RTF \objdata at offset 0x3C 4662 bytes
SHA-256: 6dfc92d155997be7d2ab55a6eb4345340b6feba6f74a09308624d6c77fa6e3b3

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