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

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

$ cat analysis.txt
=== THREAT ANALYSIS REPORT ===
Threat Name: Trojan:Win32/Yomal!rfn
Classification:
Type:Trojan
Platform:Win32
Family:Yomal
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 Yomal

Summary:

Trojan:Win32/Yomal!rfn is a malicious program that executes using legitimate Windows tools (LOLBins) like PowerShell, mshta, and rundll32 to evade detection. It establishes persistence via scheduled tasks, downloads additional payloads using BITS, and utilizes API hooking techniques to potentially steal information or interfere with system security.

Severity:
Critical
VDM Static Detection:
Relevant strings associated with this threat:
 - !#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: 087e0bdfbea59e2b5e799537df3f4e70.exe
87ac4d92f9cb63340de45eac25dea4ef0197eec56962e34a434389c399ee7dc0
18/12/2025
→VirusTotal↓Download Sample
Filename: 8bc07575854bba3474e1eb3451d050d4f1386097fcbd6343d0f4c53bf1efc780
8bc07575854bba3474e1eb3451d050d4f1386097fcbd6343d0f4c53bf1efc780
03/12/2025
→VirusTotal↓Download Sample
Remediation Steps:
1. Isolate the affected machine from the network immediately to prevent lateral movement. 2. Use Windows Defender to perform a full scan and remove all detected components. 3. Manually investigate and remove persistence mechanisms (e.g., scheduled tasks, netsh helpers). 4. Reset all user credentials used on the system, as they may be compromised. 5. For full remediation, consider reimaging the affected device from a known-good source.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 03/12/2025. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
user@threatcheck.sh:~$ ▊