General
- Target boykisser.exe
- Size 1.6MB
- Sample260701-c9dsvsey2s
- SHA256 e432745623e2d2665ff20e2fbeaa4667042954e42f7c4673fe6e61fc258fa809
- MD5 32d2b567e00cb1e5e61165098b50e1c2
- SHA1 59d77a2ff6a4e7cbe121e68c35cacd5eb71cc47d
- SHA512 90b2f11c17357ec7417a72acc5da0ea349b765b24bbad43b997154a4f2dbe9b535a3d6416c08649ed263f19363c4c5f6202511bff7eca694c62fe96437c01a59
- SSDEEP 49152:XtWLfyzARGJEtWmUk420tqHvKDKip0NanU:IpWEhUkp0MHvelp0Nan
- TLSH T13175336154ACF39EEA6674B1367B54ECC9B1B3D5A31C0F190CD9B5FA104BB638B23484
- MD5 SHA1 SHA512 SSDEEP TLSH
Static task
static1
Behavioral task
behavioral1
Sample
boykisser.exe
Resource
win10v2004-20260513-en
Behavioral task
behavioral2
Sample
boykisser.exe
Resource
win11ltsc2024-20260629-en
Malware Config
Targets
-
- Target boykisser.exe
- Size 1.6MB
- SHA256 e432745623e2d2665ff20e2fbeaa4667042954e42f7c4673fe6e61fc258fa809
- MD5 32d2b567e00cb1e5e61165098b50e1c2
- SHA1 59d77a2ff6a4e7cbe121e68c35cacd5eb71cc47d
- SHA512 90b2f11c17357ec7417a72acc5da0ea349b765b24bbad43b997154a4f2dbe9b535a3d6416c08649ed263f19363c4c5f6202511bff7eca694c62fe96437c01a59
- SSDEEP 49152:XtWLfyzARGJEtWmUk420tqHvKDKip0NanU:IpWEhUkp0MHvelp0Nan
- TLSH T13175336154ACF39EEA6674B1367B54ECC9B1B3D5A31C0F190CD9B5FA104BB638B23484
- MD5 SHA1 SHA512 SSDEEP TLSH
-
Modifies Windows Defender Real-time Protection settings
-
Clears Windows event logs
-
Deletes shadow copies
Ransomware often targets backup files to inhibit system recovery.
-
Identifies VirtualBox via ACPI registry values (likely anti-VM)
-
Looks for VirtualBox Guest Additions in registry
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Looks for VirtualBox drivers on disk
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Modifies boot configuration data using bcdedit
-
Disables Task Manager via registry modification
-
Disables one or more Microsoft Defender components
Uses the Powershell Set-MpPreference cmdlet to disable one or more Microsoft Defender components.
-
Looks for VMWare drivers on disk
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Credentials from Password Stores: Windows Credential Manager
Suspicious access to Credentials History.
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Disables service(s)
-
Stops running service(s)
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Obfuscated Files or Information: Command Obfuscation
Adversaries may obfuscate content during command execution to impede detection.
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Power Settings
powercfg controls all configurable power system settings on a Windows system and can be abused to prevent an infected host from locking or shutting down.
-
Writes to the Master Boot Record (MBR)
Bootkits write to the MBR to gain persistence at a level below the operating system.
-
Drops file in System32 directory
-
Sets desktop wallpaper using registry
MITRE ATT&CK Enterprise v16
Execution
Command and Scripting Interpreter
1PowerShell
1System Services
2Service Execution
2Windows Management Instrumentation
1Persistence
Create or Modify System Process
4Windows Service
4Power Settings
1Pre-OS Boot
1Bootkit
1Defense Evasion
Direct Volume Access
1Impair Defenses
4Disable or Modify Tools
3Indicator Removal
3Clear Windows Event Logs
1File Deletion
2Modify Registry
4Obfuscated Files or Information
1Command Obfuscation
1Pre-OS Boot
1Bootkit
1Virtualization/Sandbox Evasion
4Credential Access
Credentials from Password Stores
2Credentials from Web Browsers
1Windows Credential Manager
1Unsecured Credentials
1Credentials In Files
1