RTF malware analysis — malicious · 5e211f659d7aff3a

MALICIOUS

RTF

142.5 KB Created: 2019-08-17 12:53:00 First seen: 2020-05-25

MD5: b7cd9db54b3738b08724e87a64d4df62 SHA-1: e411343d6c5b8c35778b5166c091607a6a542a8d SHA-256: 5e211f659d7aff3a02729fa49080b8bd1d8b31ee13cca23b4b6a48ee95bb7e71

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 update automatically, triggering an exploit for CVE-2017-8759. This exploit likely facilitates the execution of shellcode found within the embedded object, which is flagged as a suspicious artifact. The primary goal appears to be the execution of a secondary payload, although the specific nature of that payload cannot be determined from the provided evidence.

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_off0001f72e.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1F72E	1349 bytes
SHA-256: `6a56d69572088403daa408c7c126c2fd108679cd5c685f10dc3450a6729d2066`
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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