RTF / .DOC malware analysis — malicious · 0f65e4a9a6e0df89

MALICIOUS

RTF / .DOC

217.8 KB First seen: 2022-04-22

MD5: 4e14c8b4fbeda50c2175d49930dfa42f SHA-1: 9bda226e76999775b5aba10b08e2fabffc1d1bf0 SHA-256: 0f65e4a9a6e0df896557ec1e72b9e378ce3fa150c4f8d1582e2fb49f3f9e49fc

200 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE objects and utilizes a Composite Moniker, strongly indicating exploitation of CVE-2017-8570. This vulnerability is known to drop and execute a script, likely leading to further malicious activity. The extracted artifact objdata_00_off000007d2.bin is flagged as a suspicious script execution term.

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` `f15039057c0d54051f121774ed8d8262b84602ad3b0a01047fe921f56f37efb2`	rtf-objdata-decoded	RTF \objdata at offset 0x7D2	15847 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off00008932.bin` `7b74a822cc160a0a46dc6db6fcbc7a2291eea6fdb58fa98ed0d9b3907cb827e4`	rtf-objdata-decoded	RTF \objdata at offset 0x8932	2632 bytes
`objdata_02_off00009ed5.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x9ED5	12297 bytes

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