RTF malware analysis — malicious · 4451b8de06ef48cd

MALICIOUS

RTF

1.21 MB Created: 2019-09-17 13:59:00 First seen: 2020-08-10

MD5: 462466cb1e8ea60055a12e8cbfe69fce SHA-1: 4d5ddadf01ba0df65a09274d3bad101d914c9bcf SHA-256: 4451b8de06ef48cdbbc039139b9ba5015234cba0c34aa0180f1fb7f9cd7c7e10

162 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded OLE object that is configured to automatically update and activate, exploiting CVE-2017-8759. This mechanism is commonly used to download and execute a secondary malicious payload. The extracted OLE object data is flagged as a potential shellcode candidate, further supporting the payload execution hypothesis. No specific malware family could be identified.

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 1 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
Suspicious extracted artifact medium 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 In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00120f92.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x120F92	1351 bytes
SHA-256: `f821f2e17769e489b9119b0c8bb18a5b9a2723c7f546e48ced71363b5031c789`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_STR_LOADLIBRARY, SC_STR_URLDOWNLOAD, SC_PEB_ACCESS Static shellcode analysis recovered API/import strings: LoadLibraryW, GetProcAddress, URLDownloadToFileW, ExitProcess

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