RTF / .DOC malware analysis — malicious · 41b87ee173cb903d

MALICIOUS

RTF / .DOC

223.6 KB First seen: 2022-07-28

MD5: 0d79c841d48e8f7a3685e40c8ae54dd4 SHA-1: 399086d07488b1d392447939bd716d2d9bf80c64 SHA-256: 41b87ee173cb903df8001ba92898601a55debd083abcfd19a1ce1736c7d3cd7b

200 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File T1559.002 Component Object Model Hijacking T1140 Deobfuscate/Decode Files or Information

The RTF file contains multiple OLE objects, with critical heuristics indicating the exploitation of CVE-2017-8570. This vulnerability is known to drop and execute SCT scripts. The embedded OLE object data, specifically at offset 0xA058, is associated with this exploit, suggesting the file's primary purpose is to deliver a secondary payload via script execution.

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` `29564c8e1135ce96ec2bbcae85ebafed1a4194736bf2dc922f1adce97c516806`	rtf-objdata-decoded	RTF \objdata at offset 0x7D2	18696 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000a058.bin` `3c97121fe02f90da16cb2983b3ae893ea40de52f15d26984fbdbae19aab20ebc`	rtf-objdata-decoded	RTF \objdata at offset 0xA058	2632 bytes
`objdata_02_off0000b5fb.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0xB5FB	12297 bytes

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