RTF / .DOC malware analysis — malicious · c0107901f1c73c3f

MALICIOUS

RTF / .DOC

223.7 KB First seen: 2022-07-29

MD5: 9cba87a65b012b04e71a9b4ecf9d1058 SHA-1: 38144d589046dd98c029b381c69087f2da021aa6 SHA-256: c0107901f1c73c3f6f9bc213840e0111260124768e5904e1d85b4261723e0618

200 Risk Score

Malware Insights

MITRE ATT&CK

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

The RTF document contains OLE objects with composite monikers, triggering heuristics related to CVE-2017-8570. This vulnerability allows for the dropping and execution of a script, likely a second-stage payload. The embedded OLE object data and associated heuristics strongly indicate exploitation of this known 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_off000007d2.bin` `3af82852db106d36bbf6d8271543f8d1ee89a81afa158258e57607d868eca048`	rtf-objdata-decoded	RTF \objdata at offset 0x7D2	18738 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000a0ae.bin` `3c97121fe02f90da16cb2983b3ae893ea40de52f15d26984fbdbae19aab20ebc`	rtf-objdata-decoded	RTF \objdata at offset 0xA0AE	2632 bytes
`objdata_02_off0000b651.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0xB651	12297 bytes

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