Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 2279eff3131fab0e…

MALICIOUS

RTF / .DOC

1.67 MB
MD5: 6ba40d69724dbb0dfa0536c358ced2dc SHA-1: c377bb6ebbfd2161358bd1e6dc9364988b5d2969 SHA-256: 2279eff3131fab0ef1e26a662908291e562d5de987b5b864221506a254c4cf41
220 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.001 PowerShell

The sample is an RTF document containing OLE object data, specifically related to the Equation Editor. Critical heuristics indicate the presence of CVE-2017-11882, a known vulnerability that allows for remote code execution. The embedded OLE object is likely a second-stage payload, although its exact nature cannot be determined from the provided evidence. The extensive use of hex-encoded data within the OLE object suggests an attempt to obfuscate the payload.

Heuristics 5

  • Equation Editor OLE1 native payload — CVE-2017-11882 related critical CVE related CVE_2017_11882_RELATED
    RTF decodes to an OLE1 Equation.3 embedded object whose native data is large and payload-like, and \objupdate requests automatic activation. This is the delivery shape used by Equation Editor RCE documents such as CVE-2017-11882/CVE-2018-0802, but the malformed MTEF record needed for exact attribution was not recovered.
  • Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR
    RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
  • \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.
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~1744KB of hex-encoded data inside \objdata sections — may hide a payload
  • OLE object data medium RTF_OBJDATA
    RTF contains 2 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001ab2.bin
9fcd17127308f14c7b5cd50cbe53e0f9ba2b0f0913355e10f64da59cbc1bb2bc		 rtf-objdata-decoded RTF \objdata at offset 0x1AB2 872522 bytes

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