RTF malware analysis — malicious · a198230fc273d09e

MALICIOUS

RTF

261.2 KB First seen: 2020-07-24

MD5: 04b4cc5d8637d189fae3fbb843cab60c SHA-1: 67b6f22330a3a09ad6c55f26fdd06d2ad282b489 SHA-256: a198230fc273d09e8b5831e857debcf42a26ec717b7fa758876ca21ce8a45117

260 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF file contains OLE objects and triggers heuristics related to CVE-2017-8570, which is known to drop SCT scripts. The document body explicitly instructs the user to 'click Enable Editing when opening', indicating a lure to bypass security measures. The embedded OLE objects likely contain the malicious payload, which is executed upon user interaction.

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 4 \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_off000008fd.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x8FD	37915 bytes
SHA-256: `57ef4513b5a0437b76bde88183f8dddb6a315d89f4f1d1e32d45c71e94cb7f48`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): Wscript.Shell"" ) ")
`objdata_01_off00013238.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x13238	12261 bytes
SHA-256: `12289ea42203fe86d5d6e86e52672f752ead5709842d0443203b40a4917d5ece`
`objdata_02_off00019248.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x19248	2632 bytes
SHA-256: `85d6091446d36ace1a64d60e026533f555a6b0e68ed3a849a4e8a705f29415d4`

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