RTF malware analysis — malicious · 573fced8e1da77cc

MALICIOUS

RTF

1.15 MB First seen: 2020-02-04

MD5: f422bc9c0d0b9d80d09ee1fc7aed3682 SHA-1: f0ca53524f9c3e60e6dbce70d4c53007c15237e0 SHA-256: 573fced8e1da77ccf56fb9d4c9aef358e722a08ff824d852fc76e04e952ffece

480 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains OLE object data and is flagged for exploiting CVE-2017-8570, which is known to drop SCT scripts. The presence of PE headers within the hex data and ClamAV detections (Xml.Malware.Squiblydoo-6728833-0) further indicate malicious intent. The extracted artifact objdata_01_off0012524c.bin is likely the dropped script that facilitates execution.

Heuristics 10

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.
ClamAV: Xml.Malware.Squiblydoo-6728833-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xml.Malware.Squiblydoo-6728833-0
PE header (with DOS stub) in hex data critical RTF_MZ_HEX

Hex-encoded PE (MZ + DOS stub) found inside RTF — likely an embedded executable payload
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.
Package object class high RTF_OBJCLASS_PACKAGE

OLE Package object — can wrap arbitrary files
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1199KB 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 3 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000451.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x451	599774 bytes
SHA-256: `7e5f37072954ec17ed87d4777fb5614745baad32681684f18d5c1dbe6a93cdd2`
`objdata_01_off0012524c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x12524C	708 bytes
SHA-256: `9461022a876c2af4cc6fd592b223a6084fefa707f12b097e0150d523eb4ce080`
Detection ClamAV: Xml.Malware.Squiblydoo-6728833-0 Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell").Run("cmd /c %tmp%\\Setup.exe",0,false);
`objdata_02_off00125823.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x125823	2633 bytes
SHA-256: `afb1fcfae81159c9f1f429837968cbc51f9f2daa822a906351cb759918713671`

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