RTF malware analysis — malicious · b3e74270817d3283

MALICIOUS

RTF

662.9 KB

MD5: 708d6adc9d4907c0f89ef48103e9cd04 SHA-1: e6e3f0a49964c6a8a785512a897aa20ad8ae6e09 SHA-256: b3e74270817d32836eba67a836e8f18470b564f021a358706d62fd1c01dbb89e

240 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains multiple OLE objects, with specific heuristics indicating the exploitation of CVE-2017-8570 via a composite moniker. This exploit is known to drop a script file (SCT) which is then executed, leading to further malicious activity. The presence of the 'Please click Enable Editing to view the document.' lure further supports the malicious intent.

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.
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.
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_off00000bac.bin` `d244ad1730adaf249069cb09a3c0ee8f07e03721a721c8581637812770ae43b4`	rtf-objdata-decoded	RTF \objdata at offset 0xBAC	221093 bytes
`objdata_01_off0000735b.bin` `0ecba21df7170c5309069214d0ec066b76f9d1149683988ac34b0d20880a4c94`	rtf-objdata-decoded	RTF \objdata at offset 0x735B	221066 bytes
`objdata_02_off00077824.bin` `51ef705eef602ac6eb91c2063c8f50d4e54b5e051b60429031d41133bc7df645`	rtf-objdata-decoded	RTF \objdata at offset 0x77824	2632 bytes
`objdata_03_off00078dc7.bin` `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`	rtf-objdata-decoded	RTF \objdata at offset 0x78DC7	12297 bytes

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