RTF malware analysis — malicious · aa4edda7261bee9d

MALICIOUS

RTF

847.8 KB Created: 2019-02-12 18:12:00 First seen: 2020-02-04

MD5: 669a4889e9291f13550264185eb2e5d4 SHA-1: 1d51984a5ae0ea44a17be6f62544cc871e09d721 SHA-256: aa4edda7261bee9d0e6c7b569ccdffe604b6f546de0cceada9fdfa6eb31d9ad8

202 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple OLE objects, with specific heuristics indicating the use of \objupdate to force OLE activation. The critical finding is the detection of CVE-2017-8759, a known vulnerability in MSXML that allows for OLE object exploitation. This suggests the file is designed to exploit this vulnerability for client execution, likely delivered as a spearphishing attachment.

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.
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
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
OlePres presentation stream in RTF OLE object medium RTF_OLEPRES_STREAM

RTF contains an embedded OLE object with an OlePres presentation stream. OlePres is an OLE presentation marker and is not enough on its own to identify CVE-2025-21298.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00002c91.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2C91	76846 bytes
SHA-256: `548a55489f17e9ccc02ebfb1625c0f2d275c5312268326c04d68cfa94d2b42ee`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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