RTF malware analysis — malicious · 21f3e593f89fdbdf

MALICIOUS

RTF

149.6 KB Authoring application: Msftedit 5.41.15.1507

MD5: ff0cd124f1831d1372a48e8b605386ab SHA-1: f3e6eb5011060bfea84861a5969b872b62e8e040 SHA-256: 21f3e593f89fdbdf0253224429df876c3aed55318a3f065b09397650f2e7b840

202 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious File

The RTF file contains an embedded OLE object, identified as a package object, which in turn contains a PE header. ClamAV detected this embedded artifact as Win.Dropper.Bifrost-9992400-0. This indicates the RTF is designed to deliver a malicious executable. The embedded executable, embedded_rtf_000068ff.exe, is the primary IOC. The attack pattern involves luring the user to open the RTF, triggering the execution of the embedded dropper.

Heuristics 6

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
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` `9d0a332986880c6d27fa71aa6703def2141a6198ed94c731959c38a648d8ad74`	rtf-objdata-decoded	RTF \objdata at offset 0xF6	74553 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.69, consistent with packed or encrypted content.
`embedded_rtf_000068ff.exe` `bac77c4457669dfa4fb9a1334cb2d1754b1f34dfc418c7ab1fcc4298b50c3054`	embedded-pe	RTF hex-encoded MZ at offset 0x68FF	61576 bytes
Detection ClamAV: Win.Dropper.Bifrost-9992400-0 Obfuscation or payload: likely Carved artifact entropy is 7.91, consistent with packed or encrypted content.

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