RTF malware analysis — malicious · 845d38d514c9970d

MALICIOUS

RTF

261.1 KB First seen: 2020-07-24

MD5: adf71255c175b9880b89325f940b18c7 SHA-1: ab82b9049381869551f5d41f5e111e7eac7e1876 SHA-256: 845d38d514c9970d581cf00f05c5ed3aa8b32cf7b5ac8ba4363787c3cf52f82b

260 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF file contains multiple indicators of malicious OLE object embedding and activation, specifically related to CVE-2017-8570. The document body includes a lure to 'Enable Editing', suggesting the user is expected to interact with the document to trigger the exploit. The heuristic firings confirm the presence of OLE objects, composite monikers, and the specific CVE-2017-8570 exploit, which is known to drop SCT scripts.

Heuristics 8

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

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000b44.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xB44	37569 bytes
SHA-256: `83fdeba5da17a590c78f9359f4343541e215fdc420d78767c9fcf04e1352a2b9`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): Wscript.Shell"" ) ") Carved artifact contains 2 shell/COM execution token(s).
`objdata_01_off000131cb.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x131CB	12261 bytes
SHA-256: `12289ea42203fe86d5d6e86e52672f752ead5709842d0443203b40a4917d5ece`
`objdata_02_off000191dd.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x191DD	2632 bytes
SHA-256: `5de732ece55617b212baa0db7102c497ed7e809d372953a6a31ff14adb5754f5`

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