Kalambur Backdoor Curl TOR SOCKS Proxy Execution

 1title: Kalambur Backdoor Curl TOR SOCKS Proxy Execution
 2id: e99375eb-3ee0-407a-9f90-79569cc6a01c
 3status: experimental
 4description: Detects the execution of the "curl.exe" command, referencing "SOCKS" and ".onion" domains, which could be indicative of Kalambur backdoor activity.
 5references:
 6    - https://blog.eclecticiq.com/sandworm-apt-targets-ukrainian-users-with-trojanized-microsoft-kms-activation-tools-in-cyber-espionage-campaigns
 7author: Arda Buyukkaya (EclecticIQ)
 8date: 2025-02-11
 9tags:
10    - attack.execution
11    - attack.command-and-control
12    - attack.t1090
13    - attack.t1573
14    - attack.t1071.001
15    - attack.t1059.001
16    - attack.s0183
17    - detection.emerging-threats
18logsource:
19    category: process_creation
20    product: windows
21detection:
22    selection_img:
23        Image|endswith: '\curl.exe'
24    selection_socks:
25        CommandLine|contains:
26            - 'socks5h://'
27            - 'socks5://'
28            - 'socks4a://'
29    selection_onion:
30        CommandLine|contains: '.onion'
31    condition: all of selection_*
32falsepositives:
33    - Unlikely
34level: high