RTF / .DOC malware analysis — malicious · d14a03c89e7cff37

MALICIOUS

RTF / .DOC

540.7 KB

MD5: 46a7f6e0750db98f6dfb87f77bf3bd2a SHA-1: 29781ec7fa361cbdfb3de598a23837e44922aefd SHA-256: d14a03c89e7cff37e7744b2a880051aa6ce864ff294b26b8a8981bf24567b009

222 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1068 Exploitation for Privilege Escalation

The sample is an RTF document that leverages CVE-2017-11882, as indicated by the critical heuristic firings for RTF_EQUATION_EDITOR and CVE_2017_11882_RELATED. The presence of an automatically linked OLE object and a forced OLE activation (“

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 2 \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_off0000156d.bin` `18499a3f769521f6917085bba3850cb08458b1147be2cb5bfe75539fa4b81413`	rtf-objdata-decoded	RTF \objdata at offset 0x156D	219296 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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