RTF malware analysis — malicious · a3db7b5b9cbac47f

MALICIOUS

RTF

63.7 KB Created: 2017-08-17 05:47:00 First seen: 2019-04-18

MD5: f0368f7f9f083bbf524bbf4b17f07249 SHA-1: c491f5313b340397a96f1e6c423481b066636a7b SHA-256: a3db7b5b9cbac47f22767ec7170a976af554444e3e0d28dcdab47e3b39c008ee

242 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 configured to automatically update and activate, exploiting CVE-2017-8759. This mechanism is commonly used to download and execute secondary payloads, such as shellcode or executables, from a remote location. The presence of suspicious extracted artifacts further supports this conclusion.

Heuristics 7

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.
Package object class high RTF_OBJCLASS_PACKAGE

OLE Package object — can wrap arbitrary files
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
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://the.earth.li/~sgtatham/putty/0.70/w32/putty.exeIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00002943.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2943	1000 bytes
SHA-256: `1991ff630b41d4683720928e416564d0136e445662579070bdebcd1d4140cf60`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered URL(s): https://the.earth.li/~sgtatham/putty/0.70/w32/putty.exe Static shellcode analysis recovered command string(s): WScript.Shell");, powershell.exe -ExecutionPolicy Bypass -windowstyle hidden -command ';

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