Malicious RTF — malware analysis report

Static analysis result for SHA-256 8afb379f5bc64de5…

MALICIOUS

RTF

16.8 KB Authoring application: Riched20 6.3.9600 First seen: 2021-06-04
MD5: c0ff7d661c937b43dcf16024ac0f705d SHA-1: a51da36c05f2bc76e32ee681590dd0f1d819ba41 SHA-256: 8afb379f5bc64de5a7380f671b372385efc703158695e3d9aa4d393b88031a9f
122 Risk Score

Malware Insights

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

The RTF document contains an embedded OLE object, identified as a package object, which is highly suspicious. This object, when decoded, reveals a suspicious artifact (objdata_00_off000000f8.bin) and the document body contains an embedded URL pointing to a potential executable. This suggests the document is designed to lure the user into executing a malicious payload, likely a second-stage executable.

Heuristics 5

  • Package object class high RTF_OBJCLASS_PACKAGE
    OLE Package object — can wrap arbitrary files
  • Suspicious extracted artifact high 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.
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://127.0.0.1/1.exe In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000000f8.bin rtf-objdata-decoded RTF \objdata at offset 0xF8 4481 bytes
SHA-256: d537641f9c091af499cfe2fc54c491f1f7b0bdf9fa2baad4de77f0fee5007cb5
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered command string(s): WScript.CreateObject("WScript.Shell")