Malicious RTF — malware analysis report

Static analysis result for SHA-256 b0445935a927133e…

MALICIOUS

RTF

82.9 KB First seen: 2019-01-12
MD5: f8779fbf8d3c424bfe7e5220d564488c SHA-1: 4e413fa20ad22bf74055b44804d6561dda92bebd SHA-256: b0445935a927133e80fc241c60f3ce91eb51ec8da1f8daa5a22d83712e33cddb
180 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 the CVE-2017-11882 vulnerability within the Equation Editor. This exploit is designed to allow for the execution of arbitrary code, likely as part of a spearphishing attachment campaign. No document body or script content was available for further analysis.

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_off0000003d.bin rtf-objdata-decoded RTF \objdata at offset 0x3D 4134 bytes
SHA-256: c6420172e5ac4365dc1b30a0ae46dc931ab6d65ff11da0f0819b9c2feeb0329d

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