RTF / .DOC malware analysis — malicious · 4823690076ae0e9a

MALICIOUS

RTF / .DOC

223.6 KB First seen: 2022-07-27

MD5: b157f246e8faaafb062e72260a815a1b SHA-1: c5d64ed017b95c59cc089fff718a993202f6da46 SHA-256: 4823690076ae0e9add7d1898fd2a915836fe3da51a2f761cc2396cfe923f7828

200 Risk Score

Malware Insights

MITRE ATT&CK

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

The RTF document contains embedded OLE objects, specifically triggering the CVE-2017-8570 vulnerability. This vulnerability is known to facilitate the dropping and execution of script files, indicated by the 'drops SCT script' heuristic. The presence of multiple objdata sections and the explicit mention of Composite Moniker point towards a deliberate exploitation attempt.

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` `df9ba400fce3d259290f76dafe9654fadf687ed40a92d49afa1679f56e468891`	rtf-objdata-decoded	RTF \objdata at offset 0x7D2	18688 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000a046.bin` `3c97121fe02f90da16cb2983b3ae893ea40de52f15d26984fbdbae19aab20ebc`	rtf-objdata-decoded	RTF \objdata at offset 0xA046	2632 bytes
`objdata_02_off0000b5e9.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0xB5E9	12297 bytes

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