RTF malware analysis — malicious · 50949de2dae106e2

MALICIOUS

RTF

1008.0 KB First seen: 2019-04-17

MD5: 314b5f4f5242e0efd3ea7b0acc29ae8b SHA-1: ecf039fcd21007c49cd0475df9cdd56faa34a357 SHA-256: 50949de2dae106e2c13c92d86a6d21ca5f6f8673568e5d286e353027e2695aae

260 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains multiple indicators of exploitation for CVE-2017-8570, including the presence of Composite Monikers and OLE object data. This vulnerability is known to be used for dropping and executing script files, likely to download and run a second-stage payload. The excessive hex data within OLE objects suggests a hidden payload.

Heuristics 7

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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1020KB of hex-encoded data inside \objdata sections — may hide a payload
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 5 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object

Extracted artifacts 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000025.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x25	460514 bytes
SHA-256: `cc65d0cd8c95d34321235126eec3836a2a769147e82a7b0d8899fadec8ceb92d`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.
`objdata_01_off000f943c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xF943C	1056 bytes
SHA-256: `38e0a590df7eaa9868af736886281809be3c0fe6a6a6ea4e0327baa813cb5642`
`objdata_02_off000f9cb8.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xF9CB8	429 bytes
SHA-256: `c861ab3ab7d28ef7b028a69afbbfc89c1f5c98f0be9f15b26f0565b7d5605703`
`objdata_03_off000fa04e.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xFA04E	1351 bytes
SHA-256: `fbfe6031f946bf25c25f9783662a0516de4f34007dcfe7ff53f2b540dbc1df3f`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cscript //nologo %vbs%
`objdata_04_off000fab5a.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xFAB5A	2633 bytes
SHA-256: `1f8de175e345e5b9624b8bb5f76e9d4c1d78de3a7bbc2750e8ea7def36f04cfb`

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