RTF malware analysis — malicious · aa8f4e1266a9f0fc

MALICIOUS

RTF

468.9 KB First seen: 2019-03-10

MD5: 830ac4ea92b13e96c797ff3dd3e720fd SHA-1: 3edf2f63b9de2029d1b5adb4a6138d7d85b1eb1b SHA-256: aa8f4e1266a9f0fc679c2bc1a980abb5ffa11cf169ba8c454073d295b5d82f3a

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple OLE objects and ".objupdate" directives, indicating it is designed to exploit vulnerabilities. Specifically, the "CVE_2017_8570" heuristic firing confirms the use of a Composite Moniker to drop an SCT script, which is a known technique for executing arbitrary code. The embedded OLE object data, particularly at offset 0xB5D2, is the likely source 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 7 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
Suspicious extracted artifact info 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 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000025.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x25	229 bytes
SHA-256: `bdf6de0a64b3411ca5229f989a8704bb9f2ac8eac0d3b0c83ab62136585dd012`
`objdata_01_off0000021e.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x21E	204591 bytes
SHA-256: `cfe358006936d0e8415d88bfb213209c2c11a50737b3477fdcd1bdaef6a1b21c`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.88, consistent with packed or encrypted content.
`objdata_02_off0006d0fd.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x6D0FD	1123 bytes
SHA-256: `263c6a332f8bed14e4d9417cab11f921ef8d301d5b5d655b5a43179ea58c7434`
`objdata_03_off0006d9fc.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x6D9FC	11441 bytes
SHA-256: `5547c804ed7ffca93c822d20742f1741d3f5ee02b8a53cf7aabd952f5c062696`
`objdata_04_off00073396.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x73396	404 bytes
SHA-256: `392cac683130eb6402c5b549f0e7d1653f531eebb9a09e8b26c73d30cf6c8b98`
`objdata_05_off000736fa.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x736FA	937 bytes
SHA-256: `e21955e19ee5e9c33caa29d20574aba20d6cc02b855734ac20377ad351eddf3c`
`objdata_06_off00073eca.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x73ECA	2633 bytes
SHA-256: `ce081fd28fe7177ff803b92dfff0940839fdacbc316318ce15cbf8889540f4f0`

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