RTF malware analysis — malicious · db8031b39797277a

MALICIOUS

RTF

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

MD5: e8cae19e7c741ec8e547430522f09764 SHA-1: 9335822c05fa6aabb22bd6ba78992020e4fb76ab SHA-256: db8031b39797277a455781158fab6a00c3ce44037bc8a29abaa0c4cd80a1598e

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 forced to activate via \objupdate, triggering the CVE-2017-8759 vulnerability. This exploit is known to be used for downloading and executing secondary payloads. The presence of shellcode API strings in a decoded artifact further supports this. No specific 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_off00118d69.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x118D69	1350 bytes
SHA-256: `9ad8b76e898317e3faa8a9a54ffe7f4866edbddbd37b9111b6aa3681ddb9d8cb`
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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