Analysis
- max time kernel
140s - max time network
129s - platform
windows10-2004_x64 - resource
win10v2004-20240802-en - resource tags
- submitted
03/08/2024, 18:45
General
- Target 66ade58a5e39e_tgertert.exe
- Size 3.9MB
- Sample240803-xd2j9swfkf
- SHA256 8a415b9465a573bf7fdfeb18fc3abe3c5ab53536dfe9d144fe768f180d077cce
Malware Config
Signatures
- Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 1 IoCs
- Checks BIOS information in registry 2 TTPs 2 IoCs
BIOS information is often read in order to detect sandboxing environments.
- Drops startup file 1 IoCs
- Themida packer 10 IoCs
Detects Themida, an advanced Windows software protection system.
- Adds Run key to start application 2 TTPs 1 IoCs
- Checks whether UAC is enabled 1 TTPs 1 IoCs
- Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- System Location Discovery: System Language Discovery 1 TTPs 3 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
- Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious behavior: EnumeratesProcesses 2 IoCs
- Suspicious use of WriteProcessMemory 6 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\66ade58a5e39e_tgertert.exe"C:\Users\Admin\AppData\Local\Temp\66ade58a5e39e_tgertert.exe"1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Drops startup file
- Adds Run key to start application
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\schtasks.exeschtasks /create /f /RU "Admin" /tr "C:\ProgramData\jewkkwnf\jewkkwnf.exe" /tn "jewkkwnf HR" /sc HOURLY /rl HIGHEST2⤵
- System Location Discovery: System Language Discovery
- Scheduled Task/Job: Scheduled Task
-
-
C:\Windows\SysWOW64\schtasks.exeschtasks /create /f /RU "Admin" /tr "C:\ProgramData\jewkkwnf\jewkkwnf.exe" /tn "jewkkwnf LG" /sc ONLOGON /rl HIGHEST2⤵
- System Location Discovery: System Language Discovery
- Scheduled Task/Job: Scheduled Task
-
Network
MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Scheduled Task/Job
1Scheduled Task
1Privilege Escalation
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Scheduled Task/Job
1Scheduled Task
1Replay Monitor
Loading Replay Monitor...
Downloads
jewkkwnf.exe
memory/3568-8-0x0000000000A20000-0x00000000014FB000-memory.dmp
memory/3568-2-0x0000000076050000-0x0000000076140000-memory.dmp
memory/3568-6-0x0000000076050000-0x0000000076140000-memory.dmp
memory/3568-5-0x0000000076050000-0x0000000076140000-memory.dmp
memory/3568-4-0x0000000076050000-0x0000000076140000-memory.dmp
memory/3568-3-0x0000000076050000-0x0000000076140000-memory.dmp
memory/3568-7-0x0000000000A20000-0x00000000014FB000-memory.dmp
memory/3568-9-0x0000000000A20000-0x00000000014FB000-memory.dmp
memory/3568-0-0x0000000000A20000-0x00000000014FB000-memory.dmp
memory/3568-10-0x0000000000A20000-0x00000000014FB000-memory.dmp
memory/3568-1-0x0000000076070000-0x0000000076071000-memory.dmp
memory/3568-11-0x0000000000A20000-0x00000000014FB000-memory.dmp
memory/3568-12-0x0000000000A20000-0x00000000014FB000-memory.dmp
memory/3568-20-0x0000000000A20000-0x00000000014FB000-memory.dmp
memory/3568-21-0x0000000076070000-0x0000000076071000-memory.dmp
memory/3568-23-0x0000000076050000-0x0000000076140000-memory.dmp
memory/3568-24-0x0000000076050000-0x0000000076140000-memory.dmp
memory/3568-25-0x0000000076050000-0x0000000076140000-memory.dmp
memory/3568-26-0x0000000076050000-0x0000000076140000-memory.dmp
memory/3568-38-0x0000000000A20000-0x00000000014FB000-memory.dmp