RTF malware analysis — malicious · 98decac331628902

MALICIOUS

RTF

16.6 KB First seen: 2020-09-07

MD5: f9a2ce62b666c5c49dc5e3e57d14f73a SHA-1: 4698f704360bd4aa5bd75c1c4dc45d9bce598f33 SHA-256: 98decac33162890281a96e2feeb8aab11685ebe0cdabd1dab0d690ab75a8c5bb

140 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains an embedded OLE object that is activated via \objupdate, a known technique for exploiting vulnerabilities. Specifically, the RTF_EQUATION_EDITOR heuristic indicates a likely exploit targeting the Equation Editor component. The extracted artifact 'objdata_00_off00002048.bin' is likely shellcode intended to execute arbitrary code, facilitating the download and execution of further malicious content.

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_off00002048.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2048	1575 bytes
SHA-256: `523059e5afd697d9f12336f4bcc448be425dd1f067fdc97ef7c8a443c9d16bd8`
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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