General
- Target cronb.sh
- Size 79KB
- Sample241001-tp164aycqp
- SHA256 7d7d0b4353401225e8da8424a7e1c5edaa091b256bdd48b7dcb158befca0b205
- MD5 2ac000e26102885305d056a5ee418faf
- SHA1 73716825db3b5a4f6fee892a3f3a7cfe7a9907d0
- SHA512 5f4a3c45f018062bb4e8ce5759db2d780076b247f2e9a7adf983f252fa1423af2ee053ef379c9d0cfe3d2ae33b608670046cfb32e1e1e97b9a77a34de8a432e6
- SSDEEP 1536:1F2cc2z4dXQIx5WfKrtq7bD0JvCFOmm5aic0xpFa:1F2ccTVtsDIK47cde2
- MD5 SHA1 SHA512 SSDEEP
Behavioral task
behavioral1
Sample
cronb.sh
Resource
ubuntu2204-amd64-20240729-en
Malware Config
Targets
-
- Target cronb.sh
- Size 79KB
- SHA256 7d7d0b4353401225e8da8424a7e1c5edaa091b256bdd48b7dcb158befca0b205
- MD5 2ac000e26102885305d056a5ee418faf
- SHA1 73716825db3b5a4f6fee892a3f3a7cfe7a9907d0
- SHA512 5f4a3c45f018062bb4e8ce5759db2d780076b247f2e9a7adf983f252fa1423af2ee053ef379c9d0cfe3d2ae33b608670046cfb32e1e1e97b9a77a34de8a432e6
- SSDEEP 1536:1F2cc2z4dXQIx5WfKrtq7bD0JvCFOmm5aic0xpFa:1F2ccTVtsDIK47cde2
- MD5 SHA1 SHA512 SSDEEP
-
XMRig Miner payload
-
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.
-
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
Execution
Command and Scripting Interpreter
1Unix Shell
1Scheduled Task/Job
1Cron
1Shared Modules
1Software Deployment Tools
1Persistence
Account Manipulation
1SSH Authorized Keys
1Hijack Execution Flow
1Dynamic Linker Hijacking
1Modify Authentication Process
1Pluggable Authentication Modules
1Scheduled Task/Job
1Cron
1Privilege Escalation
Abuse Elevation Control Mechanism
1Sudo and Sudo Caching
1Account Manipulation
1SSH Authorized Keys
1Hijack Execution Flow
1Dynamic Linker Hijacking
1Scheduled Task/Job
1Cron
1Defense Evasion
Abuse Elevation Control Mechanism
1Sudo and Sudo Caching
1Deobfuscate/Decode Files or Information
1File and Directory Permissions Modification
1Linux and Mac File and Directory Permissions Modification
1Hijack Execution Flow
1Dynamic Linker Hijacking
1Indicator Removal
2Clear Linux or Mac System Logs
2Modify Authentication Process
1Pluggable Authentication Modules
1Credential Access
Adversary-in-the-Middle
1Modify Authentication Process
1Pluggable Authentication Modules
1OS Credential Dumping
1/etc/passwd and /etc/shadow
1