RTF / .DOC malware analysis — malicious · 75d6d8f27e56854d

MALICIOUS

RTF / .DOC

462.3 KB

MD5: f3e4e0a0089c13fa64ce784718881b92 SHA-1: 7437a2c8518d32da13da3fa34727b85556e89ce1 SHA-256: 75d6d8f27e56854dd04fe52e43d0d2467fc95401dc92e7bbf2b2f01c5d8624a0

182 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1559.001 Component Object Model Hijacking T1059.001 PowerShell

The sample is an RTF document that leverages the Equation Editor vulnerability (CVE-2017-11882) to execute a decoded PE file. The RTF_EQUATION_EDITOR and CVE_2017_11882_RELATED heuristics confirm this exploit. The extracted artifact 'objdata_00_off00001859.bin' is the decoded payload, which is likely a downloader or infostealer based on the nature of this exploit.

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_off00001859.bin` `95adeb2e1538f933f2e422666dc94b8702b584cb39ee49cfc6ae4ddf6f3c1dfc`	rtf-objdata-decoded	RTF \objdata at offset 0x1859	233486 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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