RTF / .DOC malware analysis — malicious · 66c5e4a7038eab91

MALICIOUS

RTF / .DOC

351.6 KB

MD5: fdadc94eaf7464687f1e8aaceb84fe6c SHA-1: f0c41c355c88ed5b06138457beba5fd62b078c49 SHA-256: 66c5e4a7038eab910a6372582bb6e8d8556edb76c125850a2362f8eed1515f35

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The critical heuristic firing CVE_2017_11882_EQUATION_OLE10NATIVE indicates the file exploits a vulnerability in Microsoft Equation Editor. This technique is commonly used to execute arbitrary code, often as part of a spearphishing attachment. The embedded OLE object data, specifically the Ole10Native stream, contains the exploit payload. No specific family could be identified from the available evidence.

Heuristics 6

Equation Editor Ole10Native payload — CVE-2017-11882 likely critical CVE likely CVE_2017_11882_EQUATION_OLE10NATIVE

RTF decodes to an activated Microsoft Equation 3.0 OLE storage whose payload is a high-entropy Ole10Native stream rather than normal Equation Native/MTEF data. This is a weaponized Equation Editor RCE delivery shape consistent with CVE-2017-11882/CVE-2018-0802.
Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM

RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
\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_off00001d04.bin` `0edf64e293b489bfa906bfb07472d0c71ec6dfff139e1d5188129b7d2c1ec516`	rtf-objdata-decoded	RTF \objdata at offset 0x1D04	64073 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.93, consistent with packed or encrypted content.

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