RTF malware analysis — malicious · 95097c4aeb9e777a

MALICIOUS

RTF

382.7 KB Created: 2022-06-15 11:31:00 First seen: 2022-06-17

MD5: a7bdbe3fd3ddc8cae4a7eb2569169b38 SHA-1: 18776d6139f6f0c74ec400126f2b4983c325aba4 SHA-256: 95097c4aeb9e777a5be7537ff8f8ea4956a181db0854ba18250e7e7432ccd5fc

224 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution T1559.001 Component Object Model Hijacking

The RTF file contains multiple indicators of malicious OLE object embedding and activation, including RTF_OBJDATA, RTF_OBJEMB, RTF_OBJUPDATE, and RTF_OBJCLASS_PACKAGE heuristics. Crucially, the CVE-2017-8759 heuristic indicates exploitation of a known vulnerability in MSXML SAX OLE activation. This suggests the file is designed to leverage this vulnerability to execute arbitrary code upon opening. No scripts were extracted, and the document body is minimal, but the OLE object exploitation is a strong indicator of malicious intent.

Heuristics 8

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.
Package object class high RTF_OBJCLASS_PACKAGE

OLE Package object — can wrap arbitrary files
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/wo

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00008065.bin` `07258a8f6e5b101909175a7f145d53fcc0c417e1de78b2bbb3558ab79141ecf1`	rtf-objdata-decoded	RTF \objdata at offset 0x8065	167871 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.
`objdata_01_off0005af44.bin` `47c2830b7a94640f5dc9676b97e71dbde74ef6b78524b88a36ef4b22e2e7a412`	rtf-objdata-decoded	RTF \objdata at offset 0x5AF44	8896 bytes
`objdata_02_off0005af5e.bin` `2c0f07b2a6f4551cfad6db1c662c46a09272c76f2298454bce6c42bc3f3a1640`	rtf-objdata-decoded	RTF \objdata at offset 0x5AF5E	8892 bytes

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