Malicious RTF — malware analysis report

Static analysis result for SHA-256 02000f331245a174…

MALICIOUS

RTF

2.08 MB First seen: 2021-06-20
MD5: f94867d048ee2f5fa9eb9032bb5bf1cb SHA-1: 1799920466fa1b95d40e31e0560146b4ffa0e002 SHA-256: 02000f331245a174e1402e9abf9c3527289a2f28698fa49d2c4b69137c740738
142 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment

The RTF document contains embedded OLE objects with automatic linking and update triggers, indicating an attempt to execute embedded content. Heuristics suggest a large amount of hex-encoded data within the OLE object, likely hiding a payload. The extracted artifact 'objdata_00_off00000ba1.bin' is a strong indicator of the embedded malicious content.

Heuristics 5

  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \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 ~2179KB 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
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000ba1.bin rtf-objdata-decoded RTF \objdata at offset 0xBA1 622670 bytes
SHA-256: 46f4acaae329d759a22d2c44d0afa6f786065f50aba6aee18bcf167ee0a0ad70
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 8.00, consistent with packed or encrypted content.