RTF / .DOC malware analysis — malicious · 4a3edbea57e335f6

MALICIOUS

RTF / .DOC

1.38 MB Created: 2019-09-17 13:59:00

MD5: ebf1f2545f4d56934b70ee736283a82a SHA-1: 0015da9c77c451f9bcae368b40310173b40833fd SHA-256: 4a3edbea57e335f6b08ad17812f1c4746d4b6741546f1c497a3b809774f81d1d

200 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.001 PowerShell

The sample is an RTF document that contains embedded OLE objects, specifically triggering heuristics for Equation Editor and the CVE-2017-8759 vulnerability. This indicates an attempt to exploit a known vulnerability for code execution. The presence of ".objupdate" suggests that the embedded object is designed to be activated automatically. While no specific malicious URLs were extracted, the exploit itself is the primary indicator of malicious intent, likely leading to a second-stage download.

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.
Equation Editor CLSID critical RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
\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
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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0014a0db.bin` `cf704c3530f1d535923b559e1f56ad97bf526a57b8733eef433f7366afe3c57a`	rtf-objdata-decoded	RTF \objdata at offset 0x14A0DB	3732 bytes

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