RTF malware analysis — malicious · b72bddf1b3ddfe92

MALICIOUS

RTF

241.9 KB First seen: 2020-08-25

MD5: 0dd495a7d1c5863c7ef1061ab951104a SHA-1: 98daf2745c58392a17152a365c7c01a66adee8ed SHA-256: b72bddf1b3ddfe921932589e2522993f6fe38942845ded0ed0d657c6f5bd6003

300 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF file contains multiple indicators of OLE object manipulation, including composite monikers and automatic linking, strongly suggesting exploitation of CVE-2017-8570. The document body explicitly prompts the user to 'Enable Editing', a common lure for macro-based or OLE-based malware delivery. The heuristic 'CVE_2017_8570: Composite Moniker' indicates the file is designed to drop an SCT script, which is then likely executed.

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.
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\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_off00000bc6.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xBC6	27687 bytes
SHA-256: `6cee20e83ad0caae464140f72f6ba44983f0361e6ae494eb281d2e616cb8bc10`
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_off0000e519.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xE519	12261 bytes
SHA-256: `cfdf79b95584afe599f8bd01e391d8904839d9495e407a353433d3f5e3be3602`
`objdata_02_off00014529.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x14529	2632 bytes
SHA-256: `640df70a90931ea171b9bd39906ee065f8b6bb3d8f5d187057c6aa8339897ca6`

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