Resubmissions

01/10/2024, 16:14

241001-tp164aycqp10

31/03/2022, 14:02

220331-rb4c7ahaek9

General

  • Target
    cronb.sh
  • Size 79KB
  • Sample241001-tp164aycqp
  • SHA256 7d7d0b4353401225e8da8424a7e1c5edaa091b256bdd48b7dcb158befca0b205
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Targets

    • Target
      cronb.sh
    • Size 79KB
    • SHA256 7d7d0b4353401225e8da8424a7e1c5edaa091b256bdd48b7dcb158befca0b205
    • MD5 SHA1 SHA512 SSDEEP
    • XMRig Miner payload

    • xmrig

      XMRig is a high performance, open source, cross platform CPU/GPU miner.

    • Modifies the dynamic linker configuration file

      Malware can modify the configuration file of the dynamic linker to preload malicous libraries with every executed process.

    • Adds new SSH keys

      Linux special file to hold SSH keys. The threat actor may add new keys for further remote access.

    • Modifies password files for system users/ groups

      Modifies files storing password hashes of existing users/ groups, likely to grant additional privileges.

    • File and Directory Permissions Modification

      Adversaries may modify file or directory permissions to evade defenses.

    • Deletes system logs

      Deletes log file which contains global system messages. Adversaries may delete system logs to minimize their footprint.

    • Executes dropped EXE

    • Modifies sudoers policy

      Adds/ Modifies rule files for sudoers policy, likely to grant additional privileges.

    • OS Credential Dumping

      Adversaries may attempt to dump credentials to use it in password cracking.

    • Writes DNS configuration

      Writes data to DNS resolver config file.

    • Abuse Elevation Control Mechanism: Sudo and Sudo Caching

      Abuse sudo or cached sudo credentials to execute code.

    • Attempts to change immutable files

      Modifies inode attributes on the filesystem to allow changing of immutable files.

    • Creates/modifies Cron job

      Cron allows running tasks on a schedule, and is commonly used for malware persistence.

    • Deletes log files

      Deletes log files on the system.

    • Disables AppArmor

      Disables AppArmor security module.

    • Enumerates running processes

      Discovers information about currently running processes on the system

    • Write file to user bin folder

MITRE ATT&CK Enterprise v15

Tasks