RTF malware analysis — malicious · 793fbdae866abc92

MALICIOUS

RTF

125.9 KB Created: 2019-09-17 13:59:00 First seen: 2020-07-02

MD5: eb41030a4e4525429b91344bac2d36bb SHA-1: d8f94707fafd39ce228b4499384e2addaadfb068 SHA-256: 793fbdae866abc9212c47d9fc50e990e1867e1f232bec043b911e3b50009b64c

162 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an RTF document containing an embedded OLE object, which is triggered by \objupdate to exploit CVE-2017-8759. This exploit is known to facilitate the execution of arbitrary code, likely to download and execute a secondary payload. The embedded OLE object and shellcode API strings further support this conclusion.

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_off0001ec16.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1EC16	1350 bytes
SHA-256: `b1d41ba5833010cd71b6e20e537a77f3118b97430a1365bdd2d2054ea2034204`
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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