Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 829b61183bd6535c…

MALICIOUS

RTF / .DOC

1.11 MB
MD5: c9fc348de2d233de337c6c22a8850f52 SHA-1: 2be509df120097921a8a2a660b2c7f9496af2a6a SHA-256: 829b61183bd6535cd7f8ecaa211cc2ebbbef3fd8124acea0ccdd8b8572524ee2
102 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The RTF document contains a large amount of OLE object data and excessive hex-encoded data, strongly suggesting it's designed to hide a payload. The presence of ".objdata" and ".objupdate" heuristics indicates the use of embedded OLE objects, which are often exploited to deliver malicious content. The extracted artifact "objdata_00_off00000609.bin" is likely the hidden payload. Without further script analysis or network indicators, the exact family and ultimate goal remain unclear, but the pattern points to a downloader or exploit delivery mechanism.

Heuristics 4

  • \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 ~1159KB of hex-encoded data inside \objdata sections — may hide a payload
  • 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_off00000609.bin
70133b816c3d39e33e991086427aa351ae9e1d7130e80f03e9a1daee95afcdab
rtf-objdata-decoded RTF \objdata at offset 0x609 579721 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.99, consistent with packed or encrypted content.