RTF malware analysis — malicious · 7cb61fa7f71aa4f3

MALICIOUS

RTF

1.02 MB

MD5: df34f255c626b78eb8af6736f217d6b9 SHA-1: e6ab34dbeed5d8292097897753b55112bdd2c6e4 SHA-256: 7cb61fa7f71aa4f3b3091622dc17ca858ef028088d0a0af04631bfe06c52d5a1

280 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF document contains multiple indicators of malicious OLE object embedding, including Composite Monikers and automatic linking, which are associated with CVE-2017-8570. The document body explicitly instructs the user to 'download the document and click Enable Editing', a common lure to bypass security measures. The presence of large amounts of hex-encoded data within OLE objects suggests a hidden payload, likely an SCT script dropped by the CVE-2017-8570 exploit.

Heuristics 8

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.
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\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 ~1037KB of hex-encoded data inside \objdata sections — may hide a payload
OLE object data medium RTF_OBJDATA

RTF contains 4 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000966.bin` `d16b4f21eb8153be912bfca292ffbb72c588334a472443ab21a6707554b582af`	rtf-objdata-decoded	RTF \objdata at offset 0x966	408272 bytes
`objdata_01_off00007115.bin` `539c66cb90dab275ac0efb21b0d4bcb2dbf887199067203e1eed669324a170e0`	rtf-objdata-decoded	RTF \objdata at offset 0x7115	408245 bytes
`objdata_02_off000d66b4.bin` `51ef705eef602ac6eb91c2063c8f50d4e54b5e051b60429031d41133bc7df645`	rtf-objdata-decoded	RTF \objdata at offset 0xD66B4	2632 bytes
`objdata_03_off000d7c57.bin` `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`	rtf-objdata-decoded	RTF \objdata at offset 0xD7C57	12297 bytes

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