RTF / .DOC malware analysis — malicious · 5eac7a4a74f8d695

MALICIOUS

RTF / .DOC

433.9 KB

MD5: a6121446855363480ca874174bce64f0 SHA-1: 2223a360b95091745ce56b7faf2f59900d5dd276 SHA-256: 5eac7a4a74f8d695de558908d732492b963ced8d35ee9732174f0be5406d94a4

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is an RTF document containing OLE object data, specifically related to Microsoft Equation Editor. Critical heuristics indicate the presence of CVE-2017-11882, a known vulnerability exploited for client execution. The embedded OLE object is likely a malicious payload, suggesting the document was delivered as a spearphishing attachment to exploit this vulnerability.

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.
Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR

RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
\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_off0000139c.bin` `4d7d46d14ed02cf3c2cb2147aa055887af7944c56ad45b86d5256b44c921d523`	rtf-objdata-decoded	RTF \objdata at offset 0x139C	219470 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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