Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 d92d24490a96b1ae…

MALICIOUS

RTF / .DOC

822.9 KB First seen: 2023-04-24
MD5: 34e7d74898fbe7db76ebaf4d8932fdf9 SHA-1: 4de0bd563df722ce117431e48eca3a81348db4bc SHA-256: d92d24490a96b1ae551185867cb27ddfdc6aa0c9ea70d66acfef764d9d425253
102 Risk Score

Malware Insights

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

The RTF document contains embedded OLE object data and is configured to automatically update and activate this object. This suggests an exploit targeting OLE object handling within RTF parsers. The presence of a high-entropy carved artifact further indicates the embedding of potentially malicious content. The primary attack vector is likely the exploitation of a vulnerability to execute arbitrary code.

Heuristics 4

  • 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.
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \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_off00000090.bin
f7ab8c6b1d5cba1b7eb23777e1a47883628ceab14bb1403df3aa0a97ae16a41c
rtf-objdata-decoded RTF \objdata at offset 0x90 421194 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 8.00, consistent with packed or encrypted content.