RTF malware analysis — malicious · 3541f3d15698711d

MALICIOUS

RTF

403.4 KB Created: 2022-07-13 15:38:00 First seen: 2022-07-14

MD5: 9d56c86249323a0080755473a9e34e58 SHA-1: 0963ad604c315f649c2b03312029a90a13845267 SHA-256: 3541f3d15698711d022541fb222a157196b5c21be4f01c5645c6a161813e85eb

184 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1059 Command and Scripting Interpreter

The RTF file contains multiple OLE objects and triggers the ".objupdate" field, indicating an attempt to activate embedded objects. The critical heuristic firing for CVE-2017-8759 confirms exploitation of this vulnerability through MSXML SAX OLE activation. This suggests the file is designed to exploit this known vulnerability to achieve code execution.

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.
Heap-spray pattern detected high SC_HEAP_SPRAY

Repeated 0x41 (A) bytes found
\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 3 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
Suspicious extracted artifact info 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.
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

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00007e73.bin` `3d5232092292c498dcdc1a72e2cf95642b68beb95401192480a1de22544a2459`	rtf-objdata-decoded	RTF \objdata at offset 0x7E73	178614 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.
`objdata_01_off000601ea.bin` `88fc218bafb1b2271fb9334d7a871f1cc3e74b7212b06f332c59ef9ad647a523`	rtf-objdata-decoded	RTF \objdata at offset 0x601EA	8896 bytes
`objdata_02_off00060204.bin` `2b49549e5ec9284652981beca078a75534d2ba3a47691962ddceb36a86f5e4f7`	rtf-objdata-decoded	RTF \objdata at offset 0x60204	8892 bytes

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