RTF malware analysis — malicious · bd32885ac8f2ffe4

MALICIOUS

RTF

4.65 MB First seen: 2020-09-24

MD5: d5c3ef489e846606de8e86f8916722f3 SHA-1: 93c35f3c785b3488866298ceba445d059bddbcf3 SHA-256: bd32885ac8f2ffe4bee76b4967205ed5831bfaf75e945f803561fe99eecdf614

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF file contains a large OLE object with high entropy, indicated by the RTF_OLE10NATIVE_STREAM and RTF_EXCESSIVE_HEX heuristics. The RTF_OBJUPDATE heuristic suggests that this object is designed to be activated, likely to execute a payload. The presence of a large, high-entropy embedded object strongly suggests it is used to hide a malicious payload, potentially for exploitation.

Heuristics 5

Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM

RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
\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 ~4824KB 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_off00000074.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x74	1941160 bytes
SHA-256: `912a84337aec1987edff347d98c3799de19d40ac3aae1a641bee3d2c5e41a052`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.

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