RTF malware analysis — malicious · cf6c6a5cd63d51c0

MALICIOUS

RTF

2.51 MB Created: 2019-09-17 13:59:00 First seen: 2020-05-25

MD5: 6d6278a068b4e0693e64983d9b7ba8c0 SHA-1: 5a9f10fed647d599dba9fab1736c5b52d6a1dd04 SHA-256: cf6c6a5cd63d51c098590d7fc6c6f8d9ebef7d9347a9fa1ed7e487726ae4f0a7

162 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains embedded OLE object data, with a specific heuristic firing for \objupdate forcing OLE activation. This is strongly indicative of exploitation for CVE-2017-8759, which allows for arbitrary code execution. The embedded OLE object was extracted and identified as a potential shellcode candidate, further supporting this attack vector. No document body text or scripts were available for analysis.

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_off0026cb69.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x26CB69	1350 bytes
SHA-256: `fec58854080691a77b29540272cbe5d752fcbc6a8aa759420a5b01941e26dd5f`
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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