RTF malware analysis — malicious · ac574945acc3d8a9

MALICIOUS

RTF

1.19 MB First seen: 2019-09-30

MD5: ba3249900e8e22c4a7ebde77eadee89e SHA-1: 02246ba17eb9f2edb42b1bae2f030dc1336b765f SHA-256: ac574945acc3d8a9d48cf173a1d52158b9b46d4e70681e6fff1ee31fd2412b61

222 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains multiple indicators of exploitation for CVE-2017-8570, including the presence of Composite Monikers and OLE object data. This vulnerability is known to be used for dropping and executing script files, likely to download and run a second-stage payload. The excessive hex data within OLE objects suggests a hidden payload.

Heuristics 7

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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1139KB of hex-encoded data inside \objdata sections — may hide a payload
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	569571 bytes
SHA-256: `5a566ffc9fe73c2018554c974a6855ef4842bbbaa6a4f5cad902e4ffafcb228f`
`objdata_02_off0011d7c3.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x11D7C3	1123 bytes
SHA-256: `263c6a332f8bed14e4d9417cab11f921ef8d301d5b5d655b5a43179ea58c7434`
`objdata_03_off0011e0c2.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x11E0C2	32167 bytes
SHA-256: `fd4349787a170085f51674defab437a4c62805752f8bda96fe68139f5c2fdc6d`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.60, consistent with packed or encrypted content.
`objdata_04_off0012dc48.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x12DC48	404 bytes
SHA-256: `392cac683130eb6402c5b549f0e7d1653f531eebb9a09e8b26c73d30cf6c8b98`
`objdata_05_off0012dfac.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x12DFAC	937 bytes
SHA-256: `e21955e19ee5e9c33caa29d20574aba20d6cc02b855734ac20377ad351eddf3c`
`objdata_06_off0012e77c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x12E77C	2633 bytes
SHA-256: `ce081fd28fe7177ff803b92dfff0940839fdacbc316318ce15cbf8889540f4f0`

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