PowerShell Download Pattern

 1title: PowerShell Download Pattern
 2id: 3b6ab547-8ec2-4991-b9d2-2b06702a48d7
 3related:
 4    - id: e6c54d94-498c-4562-a37c-b469d8e9a275
 5      type: derived
 6status: test
 7description: Detects a Powershell process that contains download commands in its command line string
 8references:
 9    - https://blog.redteam.pl/2020/06/black-kingdom-ransomware.html
10    - https://lab52.io/blog/winter-vivern-all-summer/
11    - https://hatching.io/blog/powershell-analysis/
12author: Florian Roth (Nextron Systems), oscd.community, Jonhnathan Ribeiro
13date: 2019/01/16
14modified: 2023/01/26
15tags:
16    - attack.execution
17    - attack.t1059.001
18logsource:
19    category: process_creation
20    product: windows
21detection:
22    selection_img:
23        - Image|endswith:
24              - '\powershell.exe'
25              - '\pwsh.exe'
26        - OriginalFileName:
27              - 'PowerShell.EXE'
28              - 'pwsh.dll'
29    selection_cli:
30        CommandLine|contains|all:
31            - 'new-object'
32            - 'net.webclient).'
33            - 'download'
34        CommandLine|contains:
35            - 'string('
36            - 'file('
37    condition: all of selection_*
38falsepositives:
39    - Unknown
40level: medium

References

• Black Kingdom ransomware (TTPs & IOC)

  

  red team, blue team, penetration testing, red teaming, threat hunting, digital forensics, incident response, cyber security, IT security

  
  Read More

• Winter Vivern – all Summer

  

  In July, 2021, Lab52 found a currently active infection campaign (domain still up at the time of this writing) attributed to a group referred as Wintervivern after a report published by the researc...

  
  Read More

• Hatching - Automated malware analysis solutions

  

  Automated malware analysis with Hatching Triage, the high-volume sandbox solution for SOCs, CERTs, SOARs, and MSSPs.

  
  Read More

Related rules

• Malicious PowerShell Commandlets - PoshModule
• Malicious PowerShell Commandlets - ProcessCreation
• Malicious PowerShell Commandlets - ScriptBlock
• Malicious PowerShell Scripts - FileCreation
• Malicious PowerShell Scripts - PoshModule