RTF malware analysis — malicious · 48406b7abc402681

MALICIOUS

RTF

8.9 KB First seen: 2018-10-19

MD5: cf0e1c21f7049152e6e2980e8242da8b SHA-1: 5cfd26b28768349f428b5d6f4e570e2ab2b42ee4 SHA-256: 48406b7abc402681688eadb33f9c67341c25f9a7add53677acb7f97cf6ad6ac6

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object that leverages a known vulnerability in Microsoft Equation Editor. This technique is commonly used to deliver a second-stage payload, indicated by the 'Shellcode URL' heuristic firing. The embedded object, objdata_00_off00001661.bin, is the primary artifact associated with this exploit.

Heuristics 5

Split hex Equation Editor ProgID + OLE object critical CVE likely RTF_EQUATION_EDITOR

RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
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
- http://bit.ly/2OYFm1zIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00001661.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1661	1442 bytes
SHA-256: `95809c56e4af025ca28a82ccf6a0cf9c919a4260778ebde776da9cfed7df3a53`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered URL(s): http://bit.ly/2OYFm1z

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