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

Static analysis result for SHA-256 4c5c43f4932ac497…

MALICIOUS

RTF

1.65 MB Created: 2020-06-24 17:01:00 First seen: 2020-07-24
MD5: 5ad591a0c8b8689a5337acf675d8119f SHA-1: 8218cbe07fbb35bec9b469cdd6c4e00ccde28a77 SHA-256: 4c5c43f4932ac497c716bb5ec30a7636e5056775a4d5f3f48b9e5c1414b9f7b3
342 Risk Score

Malware Insights

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

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1027 Obfuscated Files or Information

The file is an RTF document identified as a dropper by ClamAV. It contains multiple embedded OLE objects with significant amounts of hex-encoded data, including a PE header, indicating the presence of a hidden executable payload. The use of ".objupdate" and composite monikers further supports its role as a dropper designed to execute embedded content.

Heuristics 10

  • 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.
  • Package object class high RTF_OBJCLASS_PACKAGE
    OLE Package object — can wrap arbitrary files
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~1693KB of hex-encoded data inside \objdata sections — may hide a payload
  • OLE object data medium RTF_OBJDATA
    RTF contains 3 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • Suspicious extracted artifact medium 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.
  • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002b1c.bin rtf-objdata-decoded RTF \objdata at offset 0x2B1C 353631 bytes
SHA-256: 95ae99c6632559d7e66762e7ad074b24ca600f4ab7357ff39c15c94316c92e9a
objdata_01_off000b631a.bin rtf-objdata-decoded RTF \objdata at offset 0xB631A 475963 bytes
SHA-256: c5e6d1c930552e40c5023d24e4f166011f80e1ce39faf33552b75603e857009a
objdata_02_off001a19ff.bin rtf-objdata-decoded RTF \objdata at offset 0x1A19FF 1067 bytes
SHA-256: 6c1f866a8fae3f66f6de6069b134273950b7842e3f6a379ead8175b13255617e
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis found candidate code region(s). Indicators: SC_PEB_ACCESS, NOP sled

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