RTF malware analysis — malicious · 67348aa265e2504a

MALICIOUS

RTF

559.4 KB Created: 2019-09-17 13:59:00 First seen: 2020-06-01

MD5: 1776eb6862cc5a4bd8e8321117cb3a0a SHA-1: f671a9d4aa444bef17a7f1b0856c65a26b7b5876 SHA-256: 67348aa265e2504aa1a048466a767b016b3369dc0203f48eae80342102af54eb

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 triggered via \objupdate, exploiting CVE-2017-8759. This indicates an attempt to execute arbitrary code, likely to download and run a second-stage payload. The presence of shellcode API strings in a static triage heuristic further supports this. No specific malware 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_off00086368.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x86368	1414 bytes
SHA-256: `3620306b33fac3b28031acbd45187cb90c341a2927e780ccb5676e72a74aaf01`
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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