RTF malware analysis — malicious · 79a3519d29ce28ae

MALICIOUS

RTF

209.2 KB First seen: 2020-05-25

MD5: f4e17b1beefc3d4f2418b1748decb82a SHA-1: e09de66a0c1847850861719dd202527f6574cdbf SHA-256: 79a3519d29ce28ae0c2b037b6d942c3fe5d9b02b766fd358a3383981ce44d487

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, indicating it exploits a vulnerability to drop and execute a script. The document body explicitly instructs the user to 'Enable Editing', a common lure for macro-enabled malicious documents. The extracted artifact objdata_00_off000008fd.bin likely contains the malicious script.

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_off000008fd.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x8FD	11332 bytes
SHA-256: `338e4067662d5ed41e07184c9dba76904dda61dcae7df47c71379286aa9480d8`
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_off0000628a.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x628A	12261 bytes
SHA-256: `3acc104551ed66a0b887faa2f93081783f78d431d81249e2c401c14e62aac774`
`objdata_02_off0000c29c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xC29C	2632 bytes
SHA-256: `a483f12dcb6e4b0551213d4a635fd37957956b42b40e2fc9f057edbc2419eb50`

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