Rtf.Dropper.Agent — RTF malware analysis

Static analysis result for SHA-256 50fd9a43dec6f7a0…

MALICIOUS

RTF

4.1 KB First seen: 2019-12-09
MD5: 857b4d014fd93dabe392fc840a36d06d SHA-1: f844c8919d85f4fb6a1740a81004ea78bf295a1f SHA-256: 50fd9a43dec6f7a0457d015e454f4c754c34ea0b1bdf545e8019ae44ca634a2d
242 Risk Score

Malware Insights

Rtf.Dropper.Agent · confidence 95%

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

The RTF file contains an embedded OLE object with a suspicious Equation Editor ProgID, indicating exploitation of a known vulnerability (CVE-2017-11882). The ` 1033` tag and ` tf1 bidis 300 s24 tlch decor 300` suggests an attempt to execute code. The ClamAV detection `Rtf.Dropper.Agent-7120850-0` and the presence of an extracted suspicious artifact `objdata_00_off000005e0.bin` further confirm its malicious nature as a dropper.

Heuristics 6

  • Split hex Equation Editor ProgID + OLE object critical CVE likely RTF_EQUATION_EDITOR
    RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
  • ClamAV: Rtf.Dropper.Agent-7120850-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Dropper.Agent-7120850-0
  • 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 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.microsoft.com/office/word/2003/wordml In RTF body
    • http://bit.ly/2NPu7eyIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000005e0.bin rtf-objdata-decoded RTF \objdata at offset 0x5E0 1342 bytes
SHA-256: 197369f1beb72c38162a91f3d16b13a3e4b8cb1634652a3acaf6b73db3c81329
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): http://bit.ly/2NPu7ey

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