Malicious RTF — malware analysis report

Static analysis result for SHA-256 0e087dee42a242ac…

MALICIOUS

RTF

568.4 KB First seen: 2019-05-16
MD5: 4c95597c77af5949d1af1ce90b705475 SHA-1: 664cc11564a75f4f30a6fa5c986ce9e5379b6444 SHA-256: 0e087dee42a242ac77f8905d7a9ffcc40b1038f4ab79975c1ca710337c8e0266
462 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains multiple indicators of exploitation, including critical firings for Equation Editor vulnerabilities and embedded OLE objects. The presence of `RTF_MZ_HEX` and `EXTRACTED_FILE_STATIC_TRIAGE` suggests that the embedded objects contain executable code. The `RTF_INCLUDE_REMOTE` heuristic points to a URL that is likely used to download a secondary payload, which is further supported by the ClamAV detection of Win.Dropper.Gandcrab-7077551-0 on an extracted artifact.

Heuristics 11

  • 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: Win.Trojan.Agent-6593111-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-6593111-0
  • 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
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • 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_off00009bfd.bin rtf-objdata-decoded RTF \objdata at offset 0x9BFD 400 bytes
SHA-256: fa79b00817f7495218632b8aca05100fc72b724a674512e970aa8642ceaa44bc
objdata_01_off00009f57.bin rtf-objdata-decoded RTF \objdata at offset 0x9F57 259784 bytes
SHA-256: 2c99ca8d3fbed212974a6831ddabc76d948afc673b007c03f8efec0cba76488a
Detection
ClamAV: Win.Dropper.Gandcrab-7077551-0
Obfuscation or payload: likely
Carved artifact entropy is 7.92, consistent with packed or encrypted content.
objdata_02_off00088d2c.bin rtf-objdata-decoded RTF \objdata at offset 0x88D2C 366 bytes
SHA-256: 0fa30d95bf62cc1ffa400698a49b8aa525ea1a8b5cfcee170853055d544db43e
objdata_03_off00089044.bin rtf-objdata-decoded RTF \objdata at offset 0x89044 1744 bytes
SHA-256: 546cd3b765cabce8adf69d362415e8b882e2781f3e5f33ac1919818855854ba8
objdata_04_off00089e22.bin rtf-objdata-decoded RTF \objdata at offset 0x89E22 782 bytes
SHA-256: be9014234beb0c05f224b03871d694609d05449e2092f37efa7a7e2c0427f4cb
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered command string(s): WScript" & "" & rab & "" & "")
objdata_05_off0008a4cf.bin rtf-objdata-decoded RTF \objdata at offset 0x8A4CF 2620 bytes
SHA-256: e579362949fa658b405295e7ede6f41c080f831e0e397f49963b887e7c22f927
objdata_06_off0008bad8.bin rtf-objdata-decoded RTF \objdata at offset 0x8BAD8 4681 bytes
SHA-256: 75bdf0d3e6198ce8609d72f965634443d1596df6ed427f655b94bb1d92e195e5

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