Win.Trojan.Bifrose — RTF malware analysis

Static analysis result for SHA-256 1967156cb213ca60…

MALICIOUS

RTF

79.5 KB Authoring application: Msftedit 5.41.15.1507 First seen: 2015-10-13
MD5: ea4d17997520aa39116d02fbfa269aab SHA-1: add0f5e59f0054855b1b3c622d84d28b5d61a020 SHA-256: 1967156cb213ca60cbbb44a3a1c2bf89418d98aac89fa5b9714d64ed69a323d1
200 Risk Score

Malware Insights

Win.Trojan.Bifrose · confidence 95%

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF file contains embedded OLE objects, specifically a package object, which is indicative of a malicious payload delivery mechanism. ClamAV detections for Win.Trojan.Bifrose-28233 and Win.Trojan.Agent-36254 on the main file and an extracted artifact strongly suggest this is a trojan. The presence of embedded objects points towards exploitation for client execution, likely delivered via spearphishing.

Heuristics 4

  • ClamAV: Win.Trojan.Bifrose-28233 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Bifrose-28233
  • 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_off000000e9.bin rtf-objdata-decoded RTF \objdata at offset 0xE9 35816 bytes
SHA-256: 7195bb79fe560d4a3217a83b30525bbb5d3824e1e61517b9e4b1493248463582
Detection
ClamAV: Win.Trojan.Agent-36254
Obfuscation or payload: unlikely

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