RTF malware analysis — malicious · 38368101b46675d7

MALICIOUS

RTF

327.5 KB First seen: 2021-07-07

MD5: 392d4112b74a45586d0f1744324fbeb4 SHA-1: 99af98dce8252b66ea01b610cf56a6c7eb54d5dd SHA-256: 38368101b46675d7db77442650634c6fac06e29338d2910cdca25f09a350bdd3

260 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains multiple indicators of exploitation, specifically related to CVE-2017-8570 and the use of composite monikers within OLE objects. This vulnerability is known to be used for dropping and executing script files, which is strongly suggested by the 'EXTRACTED_FILE_STATIC_TRIAGE' heuristic firing on shellcode command strings and extracted files. The embedded OLE objects and objdata sections are the likely vectors for this exploit.

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.
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

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000007da.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x7DA	56429 bytes
SHA-256: `43dcf3ea7435a1ad067934479f2dbd123181479b6f44ff2f95cb8ca900c89e71`
`objdata_01_off00006f89.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x6F89	56402 bytes
SHA-256: `d0bb441645731c1c176b720e0f776c9442a97f21fcd0fb516e43887fe5fbc710`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell"")")
`objdata_02_off00023a6e.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x23A6E	2632 bytes
SHA-256: `a8e170497da15decc11753d202c99c86f7a7ffd2d52481e6b9c79a5403675379`
`objdata_03_off00025011.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x25011	12297 bytes
SHA-256: `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`

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