RTF / .DOC malware analysis — malicious · 15a2cdf4e96cece6

MALICIOUS

RTF / .DOC

234.7 KB First seen: 2022-07-13

MD5: dcb52056fcf6e567e9f5a53202e633e5 SHA-1: ca75bafab1815335d1ec2d2bf4d0414d6a380ad5 SHA-256: 15a2cdf4e96cece6b0931812aa253dd6989a728512047effbf87a218d53aa88c

200 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple OLE objects and triggers the CVE-2017-8570 vulnerability. This vulnerability is known to be used to drop and execute a script, likely a second-stage payload. The embedded OLE object data and related heuristics strongly indicate exploitation for client execution.

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` `77b1ceee6b2e091cd35406e457ae00096b6093afd41e000da37d75cd9cb9d038`	rtf-objdata-decoded	RTF \objdata at offset 0x7D2	24147 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000cca2.bin` `81ac98515bd4de25fc9f4148c41d6c0b489643c09de1fbb1e6bb969a785f1b01`	rtf-objdata-decoded	RTF \objdata at offset 0xCCA2	2632 bytes
`objdata_02_off0000e245.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0xE245	12297 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.