RTF / .DOC malware analysis — malicious · a99f01c3da08db28

MALICIOUS

RTF / .DOC

234.7 KB First seen: 2022-07-14

MD5: 8b91f1f29c974fada84211d676890ab1 SHA-1: 4cea157d9035baff91c113caa62dab1ed190d799 SHA-256: a99f01c3da08db28f98353c22a881f21851bc57c73f2de7a726ffaaf10725eb3

200 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1105 Ingress Tool Transfer

The RTF document contains embedded OLE objects, specifically triggering the CVE-2017-8570 vulnerability. This vulnerability is known to facilitate the dropping and execution of script files, such as SCT scripts, which are likely contained within the extracted objdata artifacts. The embedded artifacts suggest the file's primary purpose is to exploit this known vulnerability to execute a secondary payload.

Heuristics 6

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.
OLE object data medium RTF_OBJDATA

RTF contains 3 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
Suspicious extracted artifact medium 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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000007d2.bin` `712a98a380887223549cbd4565222ff813213df9096fd7e294b452b504b345f7`	rtf-objdata-decoded	RTF \objdata at offset 0x7D2	24175 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000ccdc.bin` `81ac98515bd4de25fc9f4148c41d6c0b489643c09de1fbb1e6bb969a785f1b01`	rtf-objdata-decoded	RTF \objdata at offset 0xCCDC	2632 bytes
`objdata_02_off0000e27f.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0xE27F	12297 bytes

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