RTF malware analysis — malicious · 21028d07b53841fa

MALICIOUS

RTF

127.3 KB Created: 2019-01-23 19:55:00 First seen: 2019-05-31

MD5: 357ac6bbf9261c53c01f219dd8c15524 SHA-1: b32edce1bea65edd5d0cb42804e5dd3ff2843c65 SHA-256: 21028d07b53841fa154d50433ad8354a56e3b16d0adb9a0497e30df71d5dc78b

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains an embedded OLE object that is triggered by \objupdate, exploiting CVE-2017-8759 for client execution. The extracted artifact 'objdata_00_off0001d3e3.bin' and the presence of shellcode API strings suggest it is a downloader. The embedded URL 'https://bit.ly/2VCZY74' is likely used to fetch the next stage of the attack.

Heuristics 5

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.
Suspicious extracted artifact critical 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.
\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 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
- https://bit.ly/2VCZY74In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0001d3e3.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1D3E3	1262 bytes
SHA-256: `85f0d0fa73850e590682935102df460178ad2af7fe11aa34584d9a7f8f7d7dd0`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered URL(s): https://bit.ly/2VCZY74 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: LoadLibraryA, GetProcAddress, URLDownloadToFileA, CreateProcessA, ExitProcess

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