Rtf.Dropper.Agent-9965975-1 RTF malware analysis — malicious · 1e6e568e2fccfeb2

MALICIOUS

RTF

1.65 MB Created: 2020-06-17 12:53:00 First seen: 2020-07-24

MD5: 1d1fb7aba66794303afc6b5420068231 SHA-1: 042c07e7db1ab01b066bd1f2c042cb652e1fc5df SHA-256: 1e6e568e2fccfeb2e0275982d5637e0be6d0ba4575685126d957061bf2d19678

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 ~1675KB 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.

Filename	Kind	Source	Size
`objdata_00_off00002b00.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2B00	475972 bytes
SHA-256: `fdc6610fc4dfbc5c13e9f387ff876edb15ce2cc404c1c89e42e15525fcd35333`
`objdata_01_off000ee1f4.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xEE1F4	353631 bytes
SHA-256: `263689aa5f456c3ae921edfade043f4e3f937bed0465a2de92489030c411f95c`
`objdata_02_off001a1a18.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1A1A18	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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