RTF / .DOC malware analysis — malicious · d38c962b13923026

MALICIOUS

RTF / .DOC

648.7 KB

MD5: 25d3de3be615812d1828c41a8625e988 SHA-1: 3c441a8d0e2731efa3f06dea7d2245991b711d14 SHA-256: d38c962b13923026496e67e8f4ae2a5ef1a5897f41018bb060e02a44442fdf11

222 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.001 PowerShell T1203 Exploitation for Code Execution

The sample is an RTF document that leverages the CVE-2017-11882 vulnerability within the Equation Editor OLE object. This vulnerability allows for the execution of arbitrary code, typically used to download and run a second-stage payload. The presence of OLE object data and specific heuristics related to Equation Editor strongly indicate this exploit vector.

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.
Decoded Equation Editor payload + PE critical RTF_EQUATION_EDITOR

RTF decodes to an Equation Editor ProgID adjacent to OLE activation and the same decoded object stream contains embedded PE bytes. This matches the Equation Editor exploit surface used by CVE-2017-11882 / CVE-2018-0802 documents, while requiring payload evidence to avoid flagging benign Equation references.
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_off00000046.bin` `fee027b2ae5293ecf1ba11a4fc3ccbf44fb5c824a4d00b25ad25cb1f57cd4386`	rtf-objdata-decoded	RTF \objdata at offset 0x46	332007 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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