RTF / .DOC malware analysis — malicious · 6c3fb369596fbd71

MALICIOUS

RTF / .DOC

300.6 KB

MD5: c86cbd23baa14a9b81bc97513eade4d8 SHA-1: 3af9dacbf4414b8b4fd51f5f9bb7dbf5788667f1 SHA-256: 6c3fb369596fbd71de5dc664bd6033849130443a16fc273efda087a530f950bf

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE object data, specifically related to Microsoft Equation Editor. Critical heuristics indicate the exploitation of CVE-2017-11882, which is known to be used to deliver malicious payloads. The extracted artifact 'objdata_00_off00001900.bin' is likely the second-stage payload.

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_off00001900.bin` `9c7b9cc62a8154d2353be08a1e7cfc2dd60f5f2bef0d4af45df6d570e210c0f1`	rtf-objdata-decoded	RTF \objdata at offset 0x1900	100221 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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