Win.Dropper.Bifrost-9992400-0 RTF malware analysis — malicious · c34ac8564815a0a3

MALICIOUS

RTF

4.12 MB Authoring application: Msftedit 5.41.15.1507

MD5: 412eeb30c13b1249d1fd88e22b4a0a9a SHA-1: 602d0b2f9bf0f05cfe4ca487234ec5809d72fd7f SHA-256: c34ac8564815a0a3f811f733c0fa84cd29da1a60e9812a69260c522fb79ee89e

242 Risk Score

Malware Insights

Win.Dropper.Bifrost-9992400-0 · confidence 95%

MITRE ATT&CK

T1559.001 Component Object Model Hijacking T1137.001 DLL Search Order Hijacking T1027 Obfuscated Files or Information

The RTF document contains a high volume of hex-encoded data within an OLE object, which is a common technique for hiding malicious payloads. Critical heuristics identified a PE header within this hex data and ClamAV detected the extracted artifact as Win.Dropper.Bifrost-9992400-0. This indicates the RTF file is acting as a dropper for a malicious 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 ~4317KB 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` `d7438e48546147c69d3c5e5c0eb55f59cbc241214f8801e6ffa449bc6e94ec13`	rtf-objdata-decoded	RTF \objdata at offset 0xF6	2104669 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` `27d8e051c1b3426d20c16349933df6098b7f7ff0d3761b3c5d30ee3693c3efc3`	embedded-pe	RTF hex-encoded MZ at offset 0x68FF	2091692 bytes
Detection ClamAV: Win.Dropper.Bifrost-9992400-0 Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

Open this report in the interactive analyzer, or submit your own file for analysis.