Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 738db003000dc1aa…

MALICIOUS

RTF / .DOC

607.1 KB
MD5: b7da28facf311d3942bf69ab2c0c34ff SHA-1: 7740e2a814c4b3640b4761afc567e0ee5364c14b SHA-256: 738db003000dc1aa9dab86a1b7e703633154021b73618f4169bf019dfbb2653f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains OLE object data with an \objupdate directive, indicating an attempt to exploit OLE object handling for code execution. The high entropy of the embedded object suggests it is likely a packed or encrypted payload. The document body is unreadable, but the heuristics strongly suggest a malicious exploit.

Heuristics 4

  • Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM
    RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
  • \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_off00000d84.bin
2a738e087625c07e8ddcab0022406810304c15b73b146add97b2582ce41922f0
rtf-objdata-decoded RTF \objdata at offset 0xD84 246861 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.99, consistent with packed or encrypted content.