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

Static analysis result for SHA-256 0e70b8e4133f8f16…

MALICIOUS

RTF

612.0 KB First seen: 2018-11-05
MD5: 72e2aa4ea8433320c4906d5e0d61aab0 SHA-1: a3b1658ad504787ff7a7574283c75e1d15530b67 SHA-256: 0e70b8e4133f8f16ea77d1fcf767030d792ea7c16312e725454a4940aef22474
382 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 OLE object data, Equation Editor CLSID, and a PE header in hex data. The presence of an INCLUDETEXT/INCLUDEPICTURE remote URL points to the download of a secondary payload from http://test1.ru/newbuild/t.php?thread=0&stats=send. The ClamAV detection name 'Rtf.Dropper.Agent-9965975-1' further supports its role as a dropper.

Heuristics 10

  • Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • 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.
  • 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 7 \objdata section(s) — embedded OLE objects
  • OlePres presentation stream in RTF OLE object medium RTF_OLEPRES_STREAM
    RTF contains an embedded OLE object with an OlePres presentation stream. OlePres is an OLE presentation marker and is not enough on its own to identify CVE-2025-21298.
  • 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/t.php?thread=0&stats=send In RTF body
    • http://nsis.sf.net/NSIS_ErrorIn RTF body

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000a009.bin rtf-objdata-decoded RTF \objdata at offset 0xA009 400 bytes
SHA-256: fa79b00817f7495218632b8aca05100fc72b724a674512e970aa8642ceaa44bc
objdata_01_off0000a363.bin rtf-objdata-decoded RTF \objdata at offset 0xA363 280274 bytes
SHA-256: c90cd53a518aedceeee6818b9ebac7f36647bd6b4b3bfe013a7ff189c1b73491
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.93, consistent with packed or encrypted content.
objdata_02_off00093b1c.bin rtf-objdata-decoded RTF \objdata at offset 0x93B1C 360 bytes
SHA-256: 65a815ac74c3a920bb26bf2ccee166222ecb8f57cf7ca61a7cceafbfa7a5e421
objdata_03_off00093e28.bin rtf-objdata-decoded RTF \objdata at offset 0x93E28 1799 bytes
SHA-256: 8634239566ba821d8db6ddf9b4c73dc185ff580a96c1a0b4f3e5f3c3ac71baaa
objdata_04_off00094c74.bin rtf-objdata-decoded RTF \objdata at offset 0x94C74 797 bytes
SHA-256: 170399a741f8364bbf06cec53623f93687bf2c6434dbf9ab2555fa18fa82966d
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered command string(s): WScript" & "" & rab & "" & "")
objdata_05_off0009533f.bin rtf-objdata-decoded RTF \objdata at offset 0x9533F 2620 bytes
SHA-256: 16f975cd20b1713e4dc7d34d66061ef75313030e0b9b73b637f1d8a0491d06f4
objdata_06_off00096948.bin rtf-objdata-decoded RTF \objdata at offset 0x96948 4681 bytes
SHA-256: 75bdf0d3e6198ce8609d72f965634443d1596df6ed427f655b94bb1d92e195e5

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