RTF malware analysis — malicious · e41e433626e9dbf6

MALICIOUS

RTF

434.8 KB First seen: 2020-07-24

MD5: 5ef2f30da7a1c59de4a3a0cf58c76b84 SHA-1: 5fb01fea09ea1674751121d07599e48d7a3e2d20 SHA-256: e41e433626e9dbf6c3a56c29c9dc60adfa53f71cd1c3bc10d682a1b2239c576d

200 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded OLE object that decodes to a PE file, strongly indicating exploitation of the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This technique is commonly used to deliver secondary payloads, and the extracted artifact is a likely candidate for shellcode. The file's purpose is to exploit this vulnerability for initial execution.

Heuristics 5

Decoded Equation Editor payload + PE critical CVE likely 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.
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.
\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 medium 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_off00000352.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x352	222172 bytes
SHA-256: `7e86d546a1bbbe5785b5fece37bf0ff0b560d1da4736af47938d35aa066bc523`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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