RTF / .DOC malware analysis — malicious · 93ccad29fcf425e4

MALICIOUS

RTF / .DOC

300.2 KB First seen: 2022-07-22

MD5: 120b50cf768a8486d91a039634bc84c9 SHA-1: f788c698e940929326781943f5c94ba5880af7b4 SHA-256: 93ccad29fcf425e454702dcb875c1ef2a83fec8e722616c0b1f39f9cd60dc734

200 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1559.001 Component Object Model Hijacking

The RTF document contains OLE object data and triggers an exploit for CVE-2017-8570. This vulnerability allows for the dropping and execution of a script, indicated by the 'CVE_2017_8570' and 'EXTRACTED_FILE_STATIC_TRIAGE' heuristic firings. The embedded OLE object and composite moniker further support the exploitation of this vulnerability.

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_off00013a58.bin` `4b4690c8d35cf3898a6f0b50153b28b711da92cee18c41608e92864805ff7817`	rtf-objdata-decoded	RTF \objdata at offset 0x13A58	18689 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0001d2ce.bin` `3c97121fe02f90da16cb2983b3ae893ea40de52f15d26984fbdbae19aab20ebc`	rtf-objdata-decoded	RTF \objdata at offset 0x1D2CE	2632 bytes
`objdata_02_off0001e871.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0x1E871	12297 bytes

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