RTF malware analysis — malicious · 4f4df7c7411e0f99

MALICIOUS

RTF

4.9 KB First seen: 2019-09-30

MD5: 8874ae75b90cb2de658a9367f8ee922b SHA-1: 4cf4c1b9438dfc3bbe4f3fd939d2769b76a26d56 SHA-256: 4f4df7c7411e0f992518a455ad8ee65088be07943172ede2a944a0d2ce19cc3e

140 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 specific ProgID related to the Equation Editor, triggering heuristics for exploitation. The ".bin" artifact suggests that shellcode was likely extracted, which is commonly used to download and execute further malicious content. The presence of ".objdata" and ".objupdate" heuristics further supports the exploitation of an OLE object for code execution.

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_off0000003b.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3B	2449 bytes
SHA-256: `70b56d2bd2e7ddd6a495a970d5e27e927ed89d377c63f2965ecad62cadb4f9c3`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL

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