Rtf.Dropper.Agent-9965975-1 — RTF malware analysis

Static analysis result for SHA-256 c2237f9c8ee1a6ea…

MALICIOUS

RTF

1.15 MB First seen: 2019-01-11
MD5: f1b66d86344a6b7721cee9092bec9d69 SHA-1: 880f0e144fe4ae8952a7318d5d4320b459c86ec2 SHA-256: c2237f9c8ee1a6ea3503bf86ac791a4a9ffeb27eaf2fb7ebe48ec39957499824
422 Risk Score

Malware Insights

Rtf.Dropper.Agent-9965975-1 · confidence 95%

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains multiple indicators of malicious activity, including embedded OLE objects with excessive hex data and a Composite Moniker, strongly suggesting exploitation of CVE-2017-8570. This vulnerability is known to drop SCT scripts, which are then likely executed. The embedded URL http://test1.ru/newbuild/tiii.php?stats=send&thread=0 is likely used to download the secondary payload.

Heuristics 11

  • Composite Moniker — CVE-2017-8570 (drops SCT script) critical CVE related CVE_2017_8570
    RTF \objdata decodes to OLE data containing the Composite Moniker — CVE-2017-8570 (drops SCT script) CLSID — the vulnerable control/moniker is embedded directly in the document's object stream, the delivery shape of this exploit. RTF objects auto-render when Word opens the file.
  • Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED
    RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
  • ClamAV: Rtf.Dropper.Agent-9965975-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Dropper.Agent-9965975-1
  • PE header (with DOS stub) in hex data critical RTF_MZ_HEX
    Hex-encoded PE (MZ + DOS stub) found inside RTF — likely an embedded executable payload
  • \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.
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~1194KB of hex-encoded data inside \objdata sections — may hide a payload
  • INCLUDETEXT/INCLUDEPICTURE remote URL high RTF_INCLUDE_REMOTE
    RTF document uses INCLUDETEXT or INCLUDEPICTURE with an http:// URL — Word can fetch the remote content on open depending on Office version and external-content settings, enabling remote template injection, NTLM capture via redirects, or payload delivery
  • 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 6 \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://test1.ru/newbuild/tiii.php?stats=send&thread=0 In RTF body

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00018655.bin rtf-objdata-decoded RTF \objdata at offset 0x18655 395 bytes
SHA-256: 015022d806f7952194d066c426f250c9954202207f63c3dcba9c262268726ef2
objdata_01_off000189a3.bin rtf-objdata-decoded RTF \objdata at offset 0x189A3 348 bytes
SHA-256: 5f5805e3d755f47386fad42dc55d5dc5051b44bd7019ab3df06f4ffc91bb22fe
objdata_02_off00018c93.bin rtf-objdata-decoded RTF \objdata at offset 0x18C93 546490 bytes
SHA-256: 681073c0e2b87ba0e627a876c5b31a35c08b92d4f0cc2d1d88b953420874583f
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.96, consistent with packed or encrypted content.
objdata_03_off00123a3f.bin rtf-objdata-decoded RTF \objdata at offset 0x123A3F 2488 bytes
SHA-256: c09f6dd977d737f4b115a76fd15e8ae2290d82be2dda02472d0938548dbb3fca
objdata_04_off00124de7.bin rtf-objdata-decoded RTF \objdata at offset 0x124DE7 726 bytes
SHA-256: 791c02b116348729dff2c987ab9af6a71b6fcbef161728546e9a937382dcece3
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered command string(s): WScript.Shell")
objdata_05_off001253d5.bin rtf-objdata-decoded RTF \objdata at offset 0x1253D5 2633 bytes
SHA-256: 1b11531569c98284e74e6ae4c14275a0ab013edb5d6151ea140c1c38c40ac41e

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