Malicious RTF — malware analysis report

Static analysis result for SHA-256 c9f7d0c5f35a8f43…

MALICIOUS

RTF

126.1 KB First seen: 2019-04-18
MD5: ececc8dceb1a139290d9c89f622d61d9 SHA-1: 45c7fd438089c28dacf223cfd6634406df9e2fb1 SHA-256: c9f7d0c5f35a8f4394d39f53b2f0f5376cc996e4e8faa49e4a64ff2175a0b6ea
142 Risk Score

Malware Insights

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

The RTF file contains OLE object data that is automatically linked and updated, indicating an attempt to exploit vulnerabilities for execution. The presence of a URL moniker suggests the object is intended to download a secondary payload. The decoded OLE object is a large, encoded blob, likely containing further malicious content or code.

Heuristics 5

  • URL Moniker in RTF OLE object high CVE related RTF_URL_MONIKER_RELATED
    RTF contains a URL Moniker GUID in OLE object context, but no decoded remote target was confirmed. Treat as related OLE2Link attack-surface evidence rather than proof of CVE-2017-0199 exploitation.
  • 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_off0000546a.bin rtf-objdata-decoded RTF \objdata at offset 0x546A 51737 bytes
SHA-256: f53c27b065a7981be6109fed1356976af3da02569d4c4f77bd49f35b825d97bc
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 long base64-like blob(s).