RTF malware analysis — malicious · 0ff6f9af892259d2

MALICIOUS

RTF

217.4 KB First seen: 2022-04-14

MD5: 941611df01709ba22634fe6d79e3a0f1 SHA-1: 51f909c6aa6fb3c394d3bfb500f6c9878c8af2f6 SHA-256: 0ff6f9af892259d25d565b60ce55eb1123d6166ea2e26aab7da3c898947f5b99

200 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains OLE object data and triggers heuristics related to CVE-2017-8570, indicating it exploits a composite moniker vulnerability. This vulnerability is known to drop and execute script files, such as SCT files, which is a common method for initial access via spearphishing attachments. The embedded OLE objects and objdata sections are the primary indicators of this exploit.

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` `455fc6aa87c8c80ad3306fdae1174602917a5f1852c8e2bc3325b0657bc3f3a7`	rtf-objdata-decoded	RTF \objdata at offset 0x7D2	15670 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off000087c2.bin` `36dcadcd9dba6c796320cf103eee4d99a0cf65218f74bac40d0f472a6487a1f8`	rtf-objdata-decoded	RTF \objdata at offset 0x87C2	2632 bytes
`objdata_02_off00009d65.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x9D65	12297 bytes

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