RTF malware analysis — malicious · 4e96ee3b819f6b5e

MALICIOUS

RTF

884.3 KB First seen: 2019-05-16

MD5: fe9d69fc9e928e62df311b6396286656 SHA-1: f79d97050e3b5898c476d4b8b08002a58cf96baa SHA-256: 4e96ee3b819f6b5e357284a6a401efe0ea7a3307d35d0d040452780a472dba3e

382 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains multiple indicators of malicious activity, including OLE object data, a composite moniker related to CVE-2017-8570, and a PE header in hex data. The critical heuristic for CVE-2017-8570 indicates the file drops an SCT script, and a high-priority heuristic flags an INCLUDETEXT/INCLUDEPICTURE remote URL, specifically http://test1.ru/newbuild/tiii.php?stats=send&thread=0, which is likely used to download and execute a second-stage payload. ClamAV also detected this as Rtf.Dropper.Agent-9965975-1.

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: 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 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/tiii.php?stats=send&thread=0 In RTF body

Extracted artifacts 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00018655.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x18655	395 bytes
SHA-256: `015022d806f7952194d066c426f250c9954202207f63c3dcba9c262268726ef2`
`objdata_01_off000189a3.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x189A3	348 bytes
SHA-256: `5f5805e3d755f47386fad42dc55d5dc5051b44bd7019ab3df06f4ffc91bb22fe`
`objdata_02_off00018c93.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x18C93	395962 bytes
SHA-256: `a90ba7ba76eb017ca6fa52e3157cc097838fe74ddb8308194d01e0dae00a160c`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.94, consistent with packed or encrypted content.
`objdata_03_off000da23f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xDA23F	2488 bytes
SHA-256: `c09f6dd977d737f4b115a76fd15e8ae2290d82be2dda02472d0938548dbb3fca`
`objdata_04_off000db5e7.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xDB5E7	726 bytes
SHA-256: `791c02b116348729dff2c987ab9af6a71b6fcbef161728546e9a937382dcece3`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell")
`objdata_05_off000dbbd5.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xDBBD5	2633 bytes
SHA-256: `1b11531569c98284e74e6ae4c14275a0ab013edb5d6151ea140c1c38c40ac41e`

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