RTF / .DOC malware analysis — malicious · b214d2cc0a10006b

MALICIOUS

RTF / .DOC

223.6 KB First seen: 2022-07-21

MD5: e52cf92c4231b1939ca180857617fb7f SHA-1: f9d81c3386390123835a180f174bdcb873e1d437 SHA-256: b214d2cc0a10006b66ddef1d2c8847ae130dc0ca01c8b8e2138cc004fae50435

200 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File

The RTF document contains embedded OLE objects that trigger the CVE-2017-8570 vulnerability. This vulnerability is known to be used to drop and execute script files, such as SCT files, which are then likely used to download and run further malicious payloads. The presence of multiple OLE object-related heuristics strongly indicates this exploitation path.

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` `6913d8581cdc50a6a6afa547f8d4074da14b3ea112a3726c02e51c88e079ab6b`	rtf-objdata-decoded	RTF \objdata at offset 0x7D2	18689 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000a048.bin` `3c97121fe02f90da16cb2983b3ae893ea40de52f15d26984fbdbae19aab20ebc`	rtf-objdata-decoded	RTF \objdata at offset 0xA048	2632 bytes
`objdata_02_off0000b5eb.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0xB5EB	12297 bytes

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