Malicious RTF — malware analysis report

Static analysis result for SHA-256 713a4db7374d0fe4…

MALICIOUS

RTF

509.3 KB Created: 2020-02-12 First seen: 2020-06-01
MD5: 807ffc3bd2eb253d25e60b957ee8ae2c SHA-1: eb0338da416e1117899126772401863f977e62ed SHA-256: 713a4db7374d0fe4adda0b9dd205b1c2e2b32da01ae86d6db7e7f16a0466f5ab
142 Risk Score

Malware Insights

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

The RTF file contains embedded OLE objects, with a specific ".objupdate" heuristic indicating that these objects are forced to activate. A critical heuristic also flagged suspicious shellcode-related artifacts, including API strings and a URL, suggesting the embedded object is a loader for further malicious activity. The presence of an embedded URL, though partially obfuscated, further supports the likelihood of a download-and-execute attack chain.

Heuristics 5

  • Suspicious extracted artifact critical 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.
  • \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
  • 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://schemas.mic In RTF body
    • http://bit.ly/2J75IgxIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00074438.bin rtf-objdata-decoded RTF \objdata at offset 0x74438 1438 bytes
SHA-256: ca79204d99f954038617e970a62bbd775fddc4e81c2e0dc5a26d4cb68ee24a1f
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): http://bit.ly/2J75Igx Static shellcode analysis found candidate code region(s). Indicators: SC_STR_LOADLIBRARY, SC_STR_URLDOWNLOAD, SC_PEB_ACCESS Static shellcode analysis recovered API/import strings: LoadLibraryA, GetProcAddress, URLDownloadToFileA, ExitProcess

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