RTF / .DOC malware analysis — malicious · d1d99d17c9867d47

MALICIOUS

RTF / .DOC

3.56 MB First seen: 2022-05-20

MD5: 0ef567022930271d8feccc7229cd1f30 SHA-1: 5b0fc1a0ceae23d7086bbf4b73840ccb4845a337 SHA-256: d1d99d17c9867d47aa2aef5d5a9cda57857c371d8376bbec63e607472f7ac371

342 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File Execution: Malicious File T1559.001 Component Object Model Hijacking: Component Object Model T1027 Obfuscated Files or Information

The RTF document contains embedded OLE objects and exploits the Equation Editor vulnerability (CVE-2017-11882). The presence of PE headers within the hex-encoded object data, along with ClamAV detection as Rtf.Dropper.Agent-9965975-1, strongly indicates that this file is designed to drop and execute a secondary payload. The extracted object data files, objdata_00_off0000129e.bin and objdata_01_off001b4256.bin, are likely the dropped executable.

Heuristics 9

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.
PE header (with DOS stub) in hex data critical RTF_MZ_HEX

Hex-encoded PE (MZ + DOS stub) found inside RTF — likely an embedded executable payload
ClamAV: Rtf.Dropper.Agent-9965975-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Dropper.Agent-9965975-1
\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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1699KB of hex-encoded data inside \objdata sections — may hide a payload
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
Suspicious extracted artifact info 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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000129e.bin` `bb2951e11c3920fd745f24c805c3db3071de199fa3869fbeddf7e97fabb99af8`	rtf-objdata-decoded	RTF \objdata at offset 0x129E	867115 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.72, consistent with packed or encrypted content.
`objdata_01_off001b4256.bin` `7a18549bfe4fb6a77756b158414057f1fbf9ca3a1c56d75635abe65de1a14399`	rtf-objdata-decoded	RTF \objdata at offset 0x1B4256	462527 bytes

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