RTF malware analysis — malicious · 86eb1326c0ff9383

MALICIOUS

RTF

220.3 KB First seen: 2019-10-01

MD5: 69c396b9d7d53fa2c378d8d026fbb972 SHA-1: a5d2081839ce3b4184505f684251022e94fa5c70 SHA-256: 86eb1326c0ff9383003de62666091d3bb24d2fd6d9ffe1b683c4f19b2be8ed33

322 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains OLE object data and triggers critical heuristics for CVE-2017-8570, indicating it exploits this vulnerability to drop a script. The embedded URL points to a Windows executable, suggesting the primary goal is to download and execute a second-stage payload. The heuristic 'SE_ENABLE_LURE' also indicates the document likely prompts the user to enable content, a common social engineering tactic.

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-7185915-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Dropper.Agent-7185915-0
\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.
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 3 \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.
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
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://tekasye.com/liquid.exe In RTF body

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000053e5.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x53E5	7326 bytes
SHA-256: `f434bb645f92bc609f5d77bd5112f675fc7a3d28c0822dc694090df865e0946b`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Sh"
`objdata_01_off00008e26.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x8E26	12261 bytes
SHA-256: `04aa08ecdc0efa41170a070ca25860aacab1aa073c2b56e46d63ff336a7e2e8b`
`objdata_02_off0000ee38.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xEE38	2632 bytes
SHA-256: `49e175993fd5e62761ad9260bac54116d1b5594e3d07b5d0b43a1852a5a1fbe9`

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