RTF malware analysis — malicious · 3f01d5e66e5e0c20

MALICIOUS

RTF

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

MD5: b1d48a8e5aa07f5d85c278410abf79c5 SHA-1: 56efe973554a17ab1890bff75892aaf6d58fa5aa SHA-256: 3f01d5e66e5e0c20237fd0085ca47822a573896c22e025f601123842afcebe15

202 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple embedded OLE objects and triggers an ".objupdate" command, indicating an attempt to activate them. The critical finding of CVE-2017-8759 suggests this is the primary exploitation vector. The embedded OLE object likely serves as a dropper for a second-stage payload, which is a common technique for delivering malware via email attachments.

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 4 \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: `96b9db568aa35faae86b9198536576a1cd8fb4e9fa5ee04d03107c8f1789d1bd`
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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