RTF malware analysis — malicious · e70f335cec2ebddd

MALICIOUS

RTF

1.15 MB Authoring application: Msftedit 5.41.15.1507

MD5: 3c128b2ac4775c3dde3675a7d9fe3a69 SHA-1: 2a7403b4d35f9d622b27e19ca9d86b6bf95423ad SHA-256: e70f335cec2ebddd5971c7ab4764bdc857b43fb53d4004e790f31a0bd679cb41

242 Risk Score

Malware Insights

MITRE ATT&CK

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

The RTF file contains a large amount of hex-encoded data within an OLE object, which is a common technique for hiding malicious payloads. This data decodes to a PE executable file. ClamAV identified this extracted artifact as Win.Dropper.Bifrost-9992400-0, indicating its function as a dropper. The presence of the PE header within the hex data further confirms the embedding of an executable.

Heuristics 7

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 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 ~1203KB 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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000000f6.bin` `344c9a02cd65c18dd659ad31a0a91dd708879a9bbc9ef42e3b66f69299fb931b`	rtf-objdata-decoded	RTF \objdata at offset 0xF6	586562 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`embedded_rtf_000068ff.exe` `f7186e15147fa2ffcec7814f35aa79d0f4d26b77fd7c41a17b1e264c7aa57fc4`	embedded-pe	RTF hex-encoded MZ at offset 0x68FF	573585 bytes
Detection ClamAV: Win.Dropper.Bifrost-9992400-0 Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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