RTF malware analysis — malicious · ad7a57d9fe77aaf3

MALICIOUS

RTF

1.46 MB

MD5: 86c85d3237eb3d4c874298e84147b8dc SHA-1: 2ba0e41d45f5db2e87996549c3ebe7a149d1ee72 SHA-256: ad7a57d9fe77aaf343581db70a3fd4a434f6a8ae92fa8731622b3ecf12319321

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious File

The RTF document contains an embedded OLE object that decodes to a PE file, indicating a likely exploit. The presence of RTF_EQUATION_EDITOR and RTF_OBJUPDATE heuristics strongly suggests the exploitation of a vulnerability within Microsoft Equation Editor. The excessive hex data further supports the hiding of a payload. The primary attack vector appears to be leveraging this exploit to download and execute a secondary malicious payload.

Heuristics 5

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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1530KB of hex-encoded data inside \objdata sections — may hide a payload
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_off00000c0b.bin` `1bd08f377f13acb573a99c62469acaa10a2f829a3933877caddabe74763aee9d`	rtf-objdata-decoded	RTF \objdata at offset 0xC0B	765165 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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