RTF malware analysis — malicious · ba2c89192643f05e

MALICIOUS

RTF

433.5 KB Created: 2022-05-05 18:31:00 First seen: 2022-07-08

MD5: 6560f5f22eb315da41df8652a772dbcd SHA-1: f444ff2386cd3ada204c3224463f4be310e5554a SHA-256: ba2c89192643f05e64f49b5cb3513a6a5bbfa719225af3b72c83587b8b774e8d

144 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1559.002 Component Object Model Hijacking

The RTF document contains embedded OLE objects and uses \objupdate to force activation, triggering the CVE-2017-8759 vulnerability. This vulnerability allows for arbitrary code execution when the MSXML SAX parser is activated, indicating a likely exploit delivery mechanism.

Heuristics 6

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.
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_off0000a50a.bin` `318230e0b27030bd2384af3ad198a1d7da76f5e6d0854ea488823a375f1cbe10`	rtf-objdata-decoded	RTF \objdata at offset 0xA50A	193752 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.
`objdata_01_off00068ee0.bin` `47c0dafc10fe174f9fac66d2cde222f91a7455e92ff72625e9425c9891f83159`	rtf-objdata-decoded	RTF \objdata at offset 0x68EE0	6847 bytes
`objdata_02_off00068efa.bin` `d47288209979cea1fe44767efebb250cf62be9b94a021206aa33bc8bebab59f3`	rtf-objdata-decoded	RTF \objdata at offset 0x68EFA	6843 bytes

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