RTF / .DOC malware analysis — malicious · 79b3d9bfe6c97a51

MALICIOUS

RTF / .DOC

669.0 KB

MD5: dc817d20bf5493c1d8da1cc922676608 SHA-1: dcd1ef30f1b0e3d13df459c458b0211e3a424613 SHA-256: 79b3d9bfe6c97a51d65ff4b458b82c1afa8bff5f7a273f2248e37dffe0cdc89a

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains an embedded OLE object that decodes to a PE file, strongly indicating exploitation of the Equation Editor vulnerability (CVE-2017-11882). This technique is commonly used to deliver a secondary payload, leading to arbitrary code execution on the victim's machine. The presence of the ".objupdate" directive further suggests an attempt to force OLE activation.

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_off0000005c.bin` `761e3e2c88a909e470a676ddf10a14b49006301c8a725709dd6b37a9f1a41eed`	rtf-objdata-decoded	RTF \objdata at offset 0x5C	342385 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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