RTF malware analysis — malicious · 4aed7ed1b882a87f

MALICIOUS

RTF

3.6 KB First seen: 2021-06-13

MD5: 11bd9134bd7caef4750d108cedfc4b57 SHA-1: a37ff651f79eac2a7777dc37a9cbbf11c3c44f9d SHA-256: 4aed7ed1b882a87f0c9f3a463cb7915a35a6a9ee1b9106385b2036d30b89cfe8

140 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains OLE object data and specifically triggers heuristics for the Equation Editor vulnerability. This indicates the file is designed to exploit a known vulnerability to execute arbitrary code upon opening. The embedded OLE object, objdata_00_off000000ec.bin, is the likely payload carrier.

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 2 \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_off000000ec.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xEC	1584 bytes
SHA-256: `f446ef4b7d2547c7d04321b88af0aa31c51b5d249eb625934dec2a405ba93b88`
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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