RTF malware analysis — malicious · 41bdc0caf2715d6a

MALICIOUS

RTF

218.9 KB First seen: 2020-01-07

MD5: 7c5382f614a80422044e352e4d8dbb53 SHA-1: 91b141413de9ae86972f55911745ca50812cee07 SHA-256: 41bdc0caf2715d6aae83b77cacda4c828d84b3691045b5bba63636c67a193beb

262 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 heuristics related to CVE-2017-8570, indicating it exploits a vulnerability to execute arbitrary code. The embedded object data likely contains shellcode or a script designed to download and run a second-stage payload from the URL http://185.61.138.111/max.exe. The document also contains a lure to enable macros or editing, further supporting its malicious intent.

Heuristics 9

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.
\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://185.61.138.111/max.exe In RTF body

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000054cd.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x54CD	6522 bytes
SHA-256: `bfc3ed78e03e8b78e98204bd82c9ec751d48fb392f7f6810eda4239ed4855490`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Sh"
`objdata_01_off000088c6.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x88C6	12261 bytes
SHA-256: `04aa08ecdc0efa41170a070ca25860aacab1aa073c2b56e46d63ff336a7e2e8b`
`objdata_02_off0000e8d8.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xE8D8	2632 bytes
SHA-256: `83b79152f039a2d9042bda0771918b0e0ce455ef878cb096a751c5414e7c5496`

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