RTF malware analysis — malicious · 36b738069ad8d67c

MALICIOUS

RTF

3.2 KB First seen: 2020-07-24

MD5: 0ec6793a00826aae9f2383819bf9dbc9 SHA-1: 57b74de5852e796b1cda498719417bf61ea243e3 SHA-256: 36b738069ad8d67c5f8451b2524cb7bc388bc8d4e555b147ab9ddfb828489678

140 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an RTF document that contains OLE object data, specifically targeting the Equation Editor vulnerability. The heuristic firings indicate that the file attempts to exploit this vulnerability to execute code, likely by embedding shellcode within the OLE object. This points to a common exploit delivery mechanism.

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_off00000033.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x33	1618 bytes
SHA-256: `9bb476cad0037a2ddc185f119df2f7ce0695990ee89902d11b423a821048070c`
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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