Analysis
- max time kernel
141s - max time network
123s - platform
windows7_x64 - resource
win7-20231129-en - resource tags
- submitted
22/12/2023, 08:54
General
- Target 7f22451fdb349cf64713c504551fa5d8.exe
- Size 2.1MB
- Sample231222-kvarnaeaar
- SHA256 4eeeb09b82ac8340354fcb7b58f1845adff3d47e4f370e612cb1de7951362aef
Malware Config
Signatures
- Contains code to disable Windows Defender 4 IoCs
A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.
- Modifies WinLogon for persistence 2 TTPs 1 IoCs
- UAC bypass 3 TTPs 1 IoCs
- Executes dropped EXE 1 IoCs
- Loads dropped DLL 1 IoCs
- UPX packed file 2 IoCs
Detects executables packed with UPX/modified UPX open source packer.
- VMProtect packed file 4 IoCs
Detects executables packed with VMProtect commercial packer.
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Suspicious use of AdjustPrivilegeToken 1 IoCs
- Suspicious use of WriteProcessMemory 4 IoCs
- System policy modification 1 TTPs 1 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\7f22451fdb349cf64713c504551fa5d8.exe"C:\Users\Admin\AppData\Local\Temp\7f22451fdb349cf64713c504551fa5d8.exe"1⤵
- Modifies WinLogon for persistence
- UAC bypass
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
- System policy modification
-
C:\Users\Admin\AppData\Local\Temp\BGtEXjsyJ0.exe"C:\Users\Admin\AppData\Local\Temp\BGtEXjsyJ0.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
-
Network
MITRE ATT&CK Enterprise v15
Privilege Escalation
Abuse Elevation Control Mechanism
1Bypass User Account Control
1Boot or Logon Autostart Execution
1Winlogon Helper DLL
1Replay Monitor
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Downloads
BGtEXjsyJ0.exe
BGtEXjsyJ0.exe
BGtEXjsyJ0.exe
memory/856-13-0x0000000004A30000-0x0000000004A70000-memory.dmp
memory/856-12-0x0000000073F40000-0x000000007462E000-memory.dmp
memory/856-11-0x0000000000D00000-0x0000000000F7E000-memory.dmp
memory/856-14-0x0000000000A80000-0x0000000000ADC000-memory.dmp
memory/856-15-0x0000000004DB0000-0x0000000004E5A000-memory.dmp
memory/856-16-0x0000000004A30000-0x0000000004A70000-memory.dmp
memory/856-20-0x0000000073F40000-0x000000007462E000-memory.dmp
memory/856-22-0x0000000004A30000-0x0000000004A70000-memory.dmp
memory/856-23-0x0000000004A30000-0x0000000004A70000-memory.dmp
memory/2544-5-0x0000000000900000-0x0000000000910000-memory.dmp
memory/2544-0-0x0000000000400000-0x00000000007C6000-memory.dmp
memory/2544-18-0x0000000000400000-0x00000000007C6000-memory.dmp
memory/2544-19-0x0000000000900000-0x0000000000910000-memory.dmp