RTF / .DOC malware analysis — malicious · 132e97d564c58a84

MALICIOUS

RTF / .DOC

223.6 KB First seen: 2022-07-27

MD5: 2b861ed6cc34809da67707f921687fbf SHA-1: c9fc23356c0a4c4b03e1ce76c05bc99e221723b3 SHA-256: 132e97d564c58a84e4254632d87a18233f276fa904956f864ccc19c5de64fa6e

200 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains OLE objects and triggers CVE-2017-8570, which is known to drop and execute a SCT script. The heuristic firings indicate the exploitation of a composite moniker related to this CVE. The embedded artifacts are likely the dropped script and its components.

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` `8fcf6a5bdcd09137a9a86da0e496c1f2af018ac0a7bc3e1d044cf4aa27095158`	rtf-objdata-decoded	RTF \objdata at offset 0x7D2	18684 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000a03e.bin` `3c97121fe02f90da16cb2983b3ae893ea40de52f15d26984fbdbae19aab20ebc`	rtf-objdata-decoded	RTF \objdata at offset 0xA03E	2632 bytes
`objdata_02_off0000b5e1.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0xB5E1	12297 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.