RTF / .DOC malware analysis — malicious · 6c0d2318d6f8df63

MALICIOUS

RTF / .DOC

167.5 KB

MD5: 534357302d86fa8920ecf8e734cd6f23 SHA-1: 956307f9aa2359ac40428d7a53c069773899f027 SHA-256: 6c0d2318d6f8df6323df48da6e4a55507e6fa68de78aa1975f974184ede69647

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded OLE object related to Equation Editor, specifically triggering CVE-2017-11882. This exploit is known to execute arbitrary code, likely a second-stage payload. The presence of the ".bin" file and the high entropy of the carved artifact further support the execution of an embedded exploit.

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_off0000004f.bin` `776f7dab83f691de07ce1cca46c457c94038a024185ea7f3f0171c37887afc0f`	rtf-objdata-decoded	RTF \objdata at offset 0x4F	85654 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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