Malicious RTF — malware analysis report

Static analysis result for SHA-256 b996ca46259553bf…

MALICIOUS

RTF

54.2 KB First seen: 2019-01-11
MD5: 811cb70a5ecd5e57b42fcf35fce57d15 SHA-1: 17482ccbc1e7cc4005d8da5e39f5c0f1b4cde8ae SHA-256: b996ca46259553bf2b4adf56333dd80ea77d1f49fdcf3c2cbac2b4b341105d44
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 triggers heuristics indicating the exploitation of CVE-2017-11882, a known vulnerability in Microsoft Equation Editor. This vulnerability allows for arbitrary code execution when the document is opened, likely leading to the download and execution of a secondary payload. The file is classified as malicious due to this exploit.

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_off0000003b.bin rtf-objdata-decoded RTF \objdata at offset 0x3B 4659 bytes
SHA-256: e44c6d1afbfaadbb5ed456829dcf1d2a3c954391742d994a525b90b9cccf0c8f

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