RTF / .DOC malware analysis — malicious · 7cc66bfd3c08fe5a

MALICIOUS

RTF / .DOC

307.5 KB

MD5: 48e6aa44408361988ad4beb8448f9d36 SHA-1: 67eb44c961bde53bc017d6dad35f9fea8006d2be SHA-256: 7cc66bfd3c08fe5a68809fe7f3a35e8948d8990460fdfd88ef4aa3abd84188d9

182 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.001 PowerShell

The sample is an RTF document that leverages the CVE-2017-11882 vulnerability by embedding an OLE object. This object is designed to execute arbitrary code upon activation, likely serving as a dropper for further malicious payloads. The presence of RTF_OBJDATA, RTF_EQUATION_EDITOR, and CVE_2017_11882_RELATED heuristics strongly indicates this exploit vector. The high entropy of the carved artifact further supports the presence of obfuscated or packed malicious code.

Heuristics 5

Equation Editor OLE1 native payload — CVE-2017-11882 related critical CVE related CVE_2017_11882_RELATED

RTF decodes to an OLE1 Equation.3 embedded object whose native data is large and payload-like, and \objupdate requests automatic activation. This is the delivery shape used by Equation Editor RCE documents such as CVE-2017-11882/CVE-2018-0802, but the malformed MTEF record needed for exact 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 1 \objdata section(s) — embedded OLE objects
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000036.bin` `2bcaaf89728602d606da2678e0a3f585e829fc562625ed7d46bc14b613f76a4b`	rtf-objdata-decoded	RTF \objdata at offset 0x36	157396 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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