RTF malware analysis — malicious · 97c20fd1f70bac15

MALICIOUS

RTF

548.0 KB First seen: 2019-06-27

MD5: 2f81e5a1817694922706093fcc0ec860 SHA-1: 986e42c0fc848462386861c31f9bc4b9420f1f67 SHA-256: 97c20fd1f70bac1571d03ff2937739d79971a8adfe5244a185fd42010fcce386

340 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains OLE object data and triggers the CVE-2017-8570 vulnerability, which is known to drop SCT scripts. ClamAV identifies the file as Win.Malware.Nemesis-7647563-0, indicating it's a known malware variant. The exploitation likely leads to the execution of a malicious script, which in turn downloads and executes a further stage 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.
ClamAV: Win.Trojan.Myxah-7541011-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Myxah-7541011-0
\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 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	255045 bytes
SHA-256: `fa74921aed428f22827000ad63022983998d0c637a24749e765340a2f3ac8b1e`
Detection ClamAV: Win.Trojan.Myxah-7541011-0 Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.
`objdata_01_off0008642c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x8642C	1056 bytes
SHA-256: `875476a153eb5226346ae3d3a2f954819b38bdf654fac478bea2848bd20a8ad4`
`objdata_02_off00086ca8.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x86CA8	429 bytes
SHA-256: `abe77819b5c8f00a8f9d68bfd13c35e652acde794f31752f4f7caf6ba59c0f9a`
`objdata_03_off0008703e.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x8703E	1351 bytes
SHA-256: `65c32d056a85d1e906c05031c507fe1d75c0f675f6a34d15e22df0e52b6d4da4`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cscript //nologo %vbs%
`objdata_04_off00087b4a.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x87B4A	2633 bytes
SHA-256: `1f8de175e345e5b9624b8bb5f76e9d4c1d78de3a7bbc2750e8ea7def36f04cfb`

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