RTF malware analysis — malicious · 7fe3c081533be787

MALICIOUS

RTF

8.9 KB First seen: 2019-08-04

MD5: 39ee68eaa44205dd600c2dbb2cac8720 SHA-1: 7d65f64322de157b6e66de129b4df39186764151 SHA-256: 7fe3c081533be7879ea307a10272ef92be8b73c272e10179401ddb453f9d0533

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded OLE object with a suspicious Equation Editor ProgID, indicating an attempt to exploit a known vulnerability. The ".bin" file extracted from the OLE object likely contains shellcode, which is designed to execute arbitrary code on the victim's machine. The presence of ".bin" file and the RTF_EQUATION_EDITOR heuristic strongly suggest exploitation for client execution.

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/2OWDfeEIn 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: `7373d18cb60bcd996a5d26ecb0180fabb68321b9d53e4850a5cb5f6c01e79637`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered URL(s): http://bit.ly/2OWDfeE

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