RTF / .DOC malware analysis — malicious · e3815c562faa44c1

MALICIOUS

RTF / .DOC

827.6 KB

MD5: e03c520528ece341dba30666d6f21973 SHA-1: ea90e9e50e2c2ef648467c612e9afda9ff471385 SHA-256: e3815c562faa44c16983af2bfaa66a15158b2d757f60ec4a02b833dc70549942

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.001 PowerShell

The sample is an RTF document that leverages the CVE-2017-11882 vulnerability within the Equation Editor component. This vulnerability allows for the embedded OLE object to be decoded and executed, leading to the delivery of a secondary payload. The presence of OLE object data and specific Equation Editor-related heuristics strongly indicate this exploit vector. The extracted PE file suggests the execution of further malicious code.

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_off00000043.bin` `79a4148d8fba232d736e7042b7c7e83d187396aa74be3d16dee387d280f53ff3`	rtf-objdata-decoded	RTF \objdata at offset 0x43	423630 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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