RTF / .DOC malware analysis — malicious · ab67b3812ec8f2fe

MALICIOUS

RTF / .DOC

229.4 KB First seen: 2022-07-14

MD5: 78facc2e5ffa881c04aeda92264724c3 SHA-1: e381e232dee059996893dcc3762738c1edc9b255 SHA-256: ab67b3812ec8f2fe9b293c6921bf91a3a2a1d4a47467aff416155d7b0613f26c

200 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The RTF document contains OLE object data and triggers a critical heuristic for CVE-2017-8570, indicating it exploits a vulnerability to drop a script. The embedded script is likely designed to download and execute a second-stage payload, as suggested by the 'Script execution terms' signal in the static triage. The file's structure and heuristic firings strongly suggest a malicious dropper.

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_off000007d1.bin` `9ae212737e5073b1573e74fda98ce4230c4e9a976a9d7855e6b9a85a5b068853`	rtf-objdata-decoded	RTF \objdata at offset 0x7D1	21569 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000b7af.bin` `0f2cec052fe8f824845b1aa6e0804ad719eb3010400f0023038dbc39515992c2`	rtf-objdata-decoded	RTF \objdata at offset 0xB7AF	2632 bytes
`objdata_02_off0000cd52.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0xCD52	12297 bytes

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