RTF / .DOC malware analysis — malicious · 5f1a8a9bebff2076

MALICIOUS

RTF / .DOC

403.7 KB

MD5: 4145b4ae33073ab580b7551ad96391d9 SHA-1: 244ff4415f2fb2950b28e02109d346eda5c848ed SHA-256: 5f1a8a9bebff2076d89f77898a1dec079e95439171ad051ca6015fed84887d4a

222 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded OLE object associated with Equation Editor, specifically triggering the CVE-2017-11882 vulnerability. This exploit is designed to execute a second-stage payload, indicated by the high entropy and MZ header found in the decoded OLE object. The presence of ".bin" in the extracted artifact name further suggests a dropped executable.

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.
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\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_off00000068.bin` `9525b0188297593596c066d4832a2150dce4a5166162a1e5cd85766f7b30f049`	rtf-objdata-decoded	RTF \objdata at offset 0x68	206558 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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