RTF malware analysis — malicious · 1ea2edfbcf615ece

MALICIOUS

RTF

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

MD5: ac4f4a362ac3ada598af04d13ccb1a1d SHA-1: d52da54469fa42f305f90321eba3dc0148ae0981 SHA-256: 1ea2edfbcf615ece79f06ac5ad8970138ed02273ac92245eb9cd9dca58104f40

162 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF document contains embedded OLE object data and uses \objupdate to force OLE activation, specifically targeting CVE-2017-8759. This vulnerability allows for the execution of embedded shellcode, as indicated by the 'Shellcode API strings' and 'Shellcode candidate region' heuristics. The extracted artifact 'objdata_00_off00154128.bin' is likely the shellcode payload.

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_off00154128.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x154128	1350 bytes
SHA-256: `cc5df9b83fadca94d072c6b428425da1d73183874ca8a4834f9f49a30299dd39`
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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