RTF / .DOC malware analysis — malicious · 18cb3a09008f4a08

MALICIOUS

RTF / .DOC

646.9 KB

MD5: 949e03fed550fccec7c4a8350320933b SHA-1: f2abd19c8037b985f15c590c6c906923f8a98413 SHA-256: 18cb3a09008f4a08fdd53c45099eb8b1f5ad053a5817075fb8ea3abcad762bc4

202 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains an embedded OLE object specifically identified as related to CVE-2017-11882, indicating exploitation for client execution. The presence of the Equation Editor ProgID and a decoded OLE1 native payload strongly suggests this vulnerability is being leveraged. The file is classified as malicious due to this exploit.

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 1 \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_off00000058.bin` `45ec85a11677dad59410ad124a6e7e41f1db9023a191f6f3aa78b32585e53c03`	rtf-objdata-decoded	RTF \objdata at offset 0x58	331040 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

Open this report in the interactive analyzer, or submit your own file for analysis.