Win.Dropper.Nemesis-6646739-0 — RTF malware analysis

Static analysis result for SHA-256 07e98d03315ed286…

MALICIOUS

RTF

617.6 KB First seen: 2020-02-04
MD5: 7b1a6fe6f29bb55785530464f9b14b6f SHA-1: 15929943dfdd1ac089318c69118e3c9b0448bdab SHA-256: 07e98d03315ed2865b1e0dc3ff8489759dd45732d757389070eee933bc7d3b20
442 Risk Score

Malware Insights

Win.Dropper.Nemesis-6646739-0 · confidence 95%

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains embedded OLE objects and exhibits characteristics of CVE-2017-8570, which is known to drop SCT scripts. The presence of a PE header in hex data and a remote URL (http://test1.ru/newbuild/xxt.php?thread=0&stats=send) strongly suggests that this file is a dropper designed to download and execute a secondary payload. ClamAV detection further confirms its malicious nature as Win.Dropper.Nemesis-6646739-0.

Heuristics 10

  • 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: Win.Dropper.Nemesis-6646739-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Dropper.Nemesis-6646739-0
  • 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 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/xxt.php?thread=0&stats=send In RTF body
    • http://nsis.sf.net/NSIS_ErrorIn 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 1091 bytes
SHA-256: 794eca03894fb80257e7ec09b5720553462a13ee66353920334e63fd4fb81c75
objdata_01_off00018f13.bin rtf-objdata-decoded RTF \objdata at offset 0x18F13 355 bytes
SHA-256: 3195b1bb51f48678bbe4dca3a7cd77a2ecfaf683d76f3b6382c1ffd5124a7220
objdata_02_off00019211.bin rtf-objdata-decoded RTF \objdata at offset 0x19211 258857 bytes
SHA-256: 42475c8251195ef7f7fcc1f0a9db47a91baa4d5450873c752037844b3c004318
Detection
ClamAV: Win.Dropper.Nemesis-6646739-0
Obfuscation or payload: likely
Carved artifact entropy is 7.83, consistent with packed or encrypted content.
objdata_03_off0009789b.bin rtf-objdata-decoded RTF \objdata at offset 0x9789B 2336 bytes
SHA-256: 1e718c98482888205ce4801225fa04eb564a3f0c52e4fd67224788723ca94f24
objdata_04_off00098b13.bin rtf-objdata-decoded RTF \objdata at offset 0x98B13 718 bytes
SHA-256: 47c9f25d1fd95c77751f00e655e09f132ca19d6899d7b72208f6d7610e321458
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered command string(s): WScript.Shell")
objdata_05_off000990f1.bin rtf-objdata-decoded RTF \objdata at offset 0x990F1 2633 bytes
SHA-256: 1b11531569c98284e74e6ae4c14275a0ab013edb5d6151ea140c1c38c40ac41e

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