RTF malware analysis — malicious · 7e21ef92d1f7c992

MALICIOUS

RTF

1.42 MB First seen: 2019-11-20

MD5: a494766d81aad49676540ef02b4e5154 SHA-1: 79a543fb751b70ee9a6c11443ca3a995068dcbcf SHA-256: 7e21ef92d1f7c992856ed45284f7c82497341b4490fe723f50f16ea27b06323b

240 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple OLE objects with excessive hex data, indicative of a hidden payload. Specifically, the presence of a composite moniker and the CVE-2017-8570 heuristic strongly suggest the file is designed to drop and execute a script, likely a second-stage payload. The embedded artifacts, particularly objdata_00_off0001baee.bin and objdata_02_off00168830.bin, are suspicious and likely contain malicious code.

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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1475KB of hex-encoded data inside \objdata sections — may hide a payload
Suspicious extracted artifact high 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.
OLE object data medium RTF_OBJDATA

RTF contains 5 \objdata section(s) — embedded OLE objects

Extracted artifacts 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0001baee.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1BAEE	681129 bytes
SHA-256: `921b43e59fd8a867a2ce2afefe5533d7c3e5132d88b96010a0a6d5313e709ee6`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.
`objdata_01_off00168481.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x168481	444 bytes
SHA-256: `9a92e9b52588416922da9ff504d0e13de10f7c9209a209170102cf83da970296`
`objdata_02_off00168830.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x168830	1245 bytes
SHA-256: `2703dc2ca3c0d9e8edd5a157bc15cef46ae50607824244b9311f26196efc1de5`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cscript //nologo %vbs%
`objdata_03_off00169220.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x169220	1178 bytes
SHA-256: `421d42edb91323a580f04b37e14277df2c3453a620830f900d07f86ca61f65f2`
`objdata_04_off00169bc3.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x169BC3	2633 bytes
SHA-256: `c652d237d34511cfc2908b6727831912f33e6dd1c0a558d188cd3c8467dd6026`

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