RTF malware analysis — malicious · 521c45880be093c9

MALICIOUS

RTF

488.1 KB First seen: 2021-05-22

MD5: 40455d02b5561fe9bd2035a46138c5a3 SHA-1: 1d6196d46809df3aed7c913ab71d9552cc49c770 SHA-256: 521c45880be093c98ddf4f03e915f3a823a89c654ee13c780fe5a542364d30b7

280 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF document contains multiple 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 'download the document and click Enable Editing', indicating a lure to bypass security measures. The embedded OLE objects likely contain the malicious payload, which is then executed.

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.
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
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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000983.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x983	141031 bytes
SHA-256: `9c597e348ee6d1d3c6d60ac34e31b6854b9f75d81d85b2ca9d3618dfbcb90ef4`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell"")")
`objdata_01_off00004291.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x4291	141005 bytes
SHA-256: `afa7e52d98ed3bbcddb7358f47e305f6ec22593b4406d57b37ec13bb16efbdd7`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell"")")
`objdata_02_off0004bcdc.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x4BCDC	2632 bytes
SHA-256: `3cd3b7d42e5855c90d6d11c54ef2670ed8970441480cc23f7d39ef08fa1c935b`
`objdata_03_off0004d27f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x4D27F	12297 bytes
SHA-256: `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`

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