RTF / .DOC malware analysis — malicious · 646e3e4ff06c99fb

MALICIOUS

RTF / .DOC

1.73 MB First seen: 2023-05-10

MD5: 071d2a3aaaffe92d52ea133877b4b891 SHA-1: b76e67ac4567888d198632bd78b0707862d6be0e SHA-256: 646e3e4ff06c99fb48889c076d190493f857a4ba4698ab21df852706933d69d1

302 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.001 Spearphishing Attachment

The RTF document contains embedded OLE objects and specifically triggers the CVE-2017-11882 vulnerability through its Equation Editor component. This indicates the file is designed to exploit this known vulnerability to execute arbitrary code, likely dropping a secondary payload as suggested by the ClamAV detection name 'Rtf.Dropper.Agent-9965975-1'. The presence of PE headers in hex data further confirms the embedded malicious executable.

Heuristics 8

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.
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_off00080073.bin` `d1dcdba36e755b0446edb1537e92fdf406d3a6d2a1ca89fe3b2915519a275564`	rtf-objdata-decoded	RTF \objdata at offset 0x80073	162632 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.81, consistent with packed or encrypted content.
`objdata_01_off000da468.bin` `7e8d2ff456ae81d87fbc46a6bbad71414810549da16e00906591e37cbba01ecb`	rtf-objdata-decoded	RTF \objdata at offset 0xDA468	187361 bytes

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