RTF / .DOC malware analysis — malicious · 02426893e1fb6b3c

MALICIOUS

RTF / .DOC

2.56 MB

MD5: 63e31fd9190ac6115f7f0e86e55077ab SHA-1: 36abaaf70244a713fd3033f64afd8823badd068e SHA-256: 02426893e1fb6b3cc4dba759e7d85a0da3696d4753921487b49bddc629d6ff77

200 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF document contains an embedded OLE object that exploits the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This exploit is designed to execute a script, likely a VBScript based on the extracted content, which attempts to download and execute a second-stage payload. The script's functionality suggests it acts as a downloader for further malicious activity.

Heuristics 6

Equation Editor activation — CVE-2017-11882 related high CVE related CVE_2017_11882_ACTIVATION_RELATED

RTF decodes to an Equation.3 ProgID and requests OLE activation with \objemb plus \objupdate. This reaches the legacy Equation Editor attack surface used by CVE-2017-11882/CVE-2018-0802 documents, but the malformed MTEF/native payload needed for stronger attribution was not recovered.
Split hex Equation Editor ProgID + OLE object critical 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 3 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000b2b.bin` `5fce6ed2ab49c2f9c9baed211a167ae6c9b9023450d76508c5668d19d36949e9`	rtf-objdata-decoded	RTF \objdata at offset 0xB2B	22080 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 shell/COM execution token(s).
`objdata_01_off0000c12b.bin` `b06602ba385d5e256f7e7c6136c2aac45aaf02d22f5a5c811833e0252236bf3b`	rtf-objdata-decoded	RTF \objdata at offset 0xC12B	126 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_02_off0000cffd.bin` `7240f1e912f057a83417b1f505df69dc6fdb95bff57c8736f379e49672af8700`	rtf-objdata-decoded	RTF \objdata at offset 0xCFFD	583136 bytes

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