RTF / .DOC malware analysis — malicious · adc82a58d8c89088

MALICIOUS

RTF / .DOC

434.9 KB

MD5: 0f99f373718685c0235b20df7624b00c SHA-1: 1ed1e0a6b306bf8bee39628cfcfa2f8e683bec77 SHA-256: adc82a58d8c890881cc7781be8e831b948dc06757664946ca302f2ef5200bd38

202 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell T1204.002 User Execution: Malicious File T1027 Obfuscated Files or Information

The sample is an RTF document that contains an embedded OLE object, specifically related to Equation Editor, and triggers the CVE-2017-11882 vulnerability. This exploit is known to facilitate the execution of arbitrary code. The presence of `RTF_EQUATION_EDITOR` and `CVE_2017_11882_RELATED` heuristics strongly indicates this attack vector. The `RTF_OBJUPDATE` heuristic suggests that the embedded object is designed to be activated automatically. The high entropy of the carved artifact further supports the presence of an executable payload.

Heuristics 6

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 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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000017e0.bin` `c978a663cb31c20d48ed95baa914494f54e69d005e76b6dc366c90cc30986897`	rtf-objdata-decoded	RTF \objdata at offset 0x17E0	219471 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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