RTF malware analysis — malicious · fa0e06f5b0499360

MALICIOUS

RTF

3.4 KB First seen: 2019-05-16

MD5: 1fe3d9722db28c2f3291ff176b989c46 SHA-1: fb32441875918900e54bf1c4f2fd74de6c128010 SHA-256: fa0e06f5b0499360f1ed3da1fe6ed565363544f8ed43029a513064d3a1ad27ba

140 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object that exploits a known vulnerability in the Equation Editor (RTF_EQUATION_EDITOR). This exploit is designed to download and execute a secondary payload, likely involving shellcode as indicated by the heuristic firings (Shellcode API strings, Shellcode candidate region). The embedded object data, objdata_00_off00000029.bin, is the primary artifact of this exploit.

Heuristics 4

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.
\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
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000029.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x29	1709 bytes
SHA-256: `60b35b361fbd093e13ad5388dfe8281ab5d1fbe62e0217392fa124762b548258`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_STR_WINEXEC, NOP sled Static shellcode analysis recovered API/import strings: ExitProcess

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