RTF / .DOC malware analysis — malicious · 628c7e9eb5a43f6e

MALICIOUS

RTF / .DOC

312.4 KB

MD5: 7370fddfd35707917b0c829fce87f1ab SHA-1: c51fb8e341106bfc50c073eb0f779fd510c304c1 SHA-256: 628c7e9eb5a43f6e2ee14f47e7f319b6ff5eeac26d26c329b25c69be6d061532

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an RTF document that contains a decoded Equation Editor payload, strongly indicating exploitation of CVE-2017-11882. This vulnerability allows for the execution of arbitrary code, which is likely used here to deliver a secondary malicious payload. The presence of OLE object data and the ".objupdate" directive further support the exploitation vector.

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.
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.
\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_off000017f7.bin` `405ba8b2b870042bb358d823566a5c6fd341b5e345394004dd126be1fa48c1ac`	rtf-objdata-decoded	RTF \objdata at offset 0x17F7	156593 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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