Win.Dropper.Bifrost-9981997-0 — RTF malware analysis

Static analysis result for SHA-256 e608a200abd925d7…

MALICIOUS

RTF

733.4 KB Authoring application: Msftedit 5.41.15.1515
MD5: 4fc6d035254af8bc89692c0b250422d2 SHA-1: 1ca40f091d4a93b4870197ad00b7671f555e0e23 SHA-256: e608a200abd925d72e0d7ea57deb639653ed373a9afa29dee50f64f63866dd04
260 Risk Score

Malware Insights

Win.Dropper.Bifrost-9981997-0 · confidence 95%

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information T1105 Ingress Tool Transfer

The RTF file contains an embedded OLE object which, upon decoding, reveals a PE header. ClamAV signatures identify this as Win.Dropper.Bifrost-9981997-0. This suggests the file is designed to drop and execute a malicious payload, likely a trojan or backdoor given the family name.

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: Win.Dropper.Bifrost-9981997-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Dropper.Bifrost-9981997-0
  • 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
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00019755.bin
a5e78198eb6ed8cab631fdcb81094883aa689ffbd3549453ef9036d379e4f24b		 rtf-objdata-decoded RTF \objdata at offset 0x19755 311453 bytes
Detection
ClamAV: Win.Dropper.Bifrost-9981997-0
Obfuscation or payload: unlikely

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