RTF malware analysis — malicious · b8a0d2ee61f89b8a

MALICIOUS

RTF

2.52 MB Authoring application: Msftedit 5.41.15.1515

MD5: f3e5b7bb373b3c41d66ea25f4ed2a8d0 SHA-1: 90aa17bf9828372439d96e22efe2edacbe15320f SHA-256: b8a0d2ee61f89b8ac1a94af2b411931e45ea537f36bea94500647052cd22360d

302 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information T1105 Ingress Tool Transfer

The RTF document contains a large OLE object with excessive hex data, including a PE header, indicating a hidden executable payload. ClamAV signatures confirm the presence of packed malware. The structure suggests a delivery mechanism for a second-stage malicious artifact.

Heuristics 8

PE header (with DOS stub) in hex data critical RTF_MZ_HEX

Hex-encoded PE (MZ + DOS stub) found inside RTF — likely an embedded executable payload
ClamAV: Win.Packed.Unsafe-6943780-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Packed.Unsafe-6943780-0
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
Package object class high RTF_OBJCLASS_PACKAGE

OLE Package object — can wrap arbitrary files
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~2644KB 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
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
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_off000000d2.bin` `2844554a6647ea3d5263bd203a40b01d530316e7034bc923bdb126fb497dafcc`	rtf-objdata-decoded	RTF \objdata at offset 0xD2	1289348 bytes
Detection ClamAV: Win.Packed.Unsafe-6943780-0 Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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