RTF malware analysis — malicious · 13a9c9ccc46986db

MALICIOUS

RTF

782.7 KB Created: 2019-01-07 23:54:00 First seen: 2019-05-31

MD5: 6a16b62132977f1a0786f44eba1a7862 SHA-1: cefe0790e700e110ccbb71d36c40740958b11fef SHA-256: 13a9c9ccc46986db2d7452d1b120cb78d7ae40ded420d924a6459188c57a8147

222 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple indicators of malicious OLE object embedding and activation, specifically targeting CVE-2017-8759. The presence of \objupdate and \objclass_package heuristics, along with the critical CVE-2017-8759 firing, strongly suggests exploitation for client execution. The embedded artifact objdata_00_off00002480.bin likely contains the malicious payload.

Heuristics 7

CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759

RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
\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
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 6 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://schemas.microsoft.com/office/word/2003/wordml In RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00002480.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2480	75310 bytes
SHA-256: `549186adbf236ea60dd07dda398a3dd404d846245d36dc2e1ee65acd92134083`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_05_off000bbe71.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xBBE71	303 bytes
SHA-256: `4b5a92d7102a98ee02b8e0ef87c226d3bf77dd1c4292ef4a2efd1a1d733edf55`

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