RTF malware analysis — malicious · 53bcd8df167f76ad

MALICIOUS

RTF

5.27 MB Authoring application: Msftedit 5.41.15.1515

MD5: a1ecdacc0b6610766490d52bdf4fae66 SHA-1: 80158caeb1ca7da37074f5e00a6ce3901bddd5c8 SHA-256: 53bcd8df167f76ad91bd8e8a29cecaaa3d87ee24e5ff18626d6a7aa542fd0243

302 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File Execution T1204.002 User Execution: Malicious File

The RTF file contains a large amount of hex-encoded data within an OLE object, which is indicative of a hidden payload. ClamAV signatures confirm this, detecting it as 'Win.Dropper.Bifrost-9992400-0'. The document body provides instructions to the user to execute this embedded object, likely leading to the execution of the dropper payload.

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.Dropper.Bifrost-9992400-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Dropper.Bifrost-9992400-0
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 ~5514KB 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_off000000d3.bin` `22b5421bd25cc1cdaf59854057a3299fd663488215d4dc2b0f7b58017e8a26fc`	rtf-objdata-decoded	RTF \objdata at offset 0xD3	2688532 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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