Analysis
- max time kernel
149s - max time network
137s - platform
windows10-2004_x64 - resource
win10v2004-20260911-en - resource tags
- submitted
14/10/2026, 04:03
General
- Target jaffacakes118_not-a-virus.HEUR.AdWare.Win32.BrainInst.heur.exe
- Size 386KB
- Sample261014-emkc8sysbx
- SHA256 903fa09b1d7bd75dbf53e58c1c7cbf7f3153a0fc830547a5c1a82e5348cc4213
Malware Config
Signatures
- Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- UPX packed file 4 IoCs
Detects executables packed with UPX/modified UPX open source packer.
- Executes a command shell one-liner 1 TTPs 1 IoCs
Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.
- Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs
The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.
- System Location Discovery: System Language Discovery 1 TTPs 2 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
- Suspicious use of WriteProcessMemory 1 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\jaffacakes118_not-a-virus.HEUR.AdWare.Win32.BrainInst.heur.exe"C:\Users\Admin\AppData\Local\Temp\jaffacakes118_not-a-virus.HEUR.AdWare.Win32.BrainInst.heur.exe"1⤵
- Reads the TCP/IP host and domain name from the registry
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\cmd.exeC:\Windows\system32\cmd.exe /c C:\Users\Admin\AppData\Local\Temp\250.bat2⤵
- Executes a command shell one-liner
- System Location Discovery: System Language Discovery
-
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
250.bat
43489.exe
memory/4208-0-0x00000000009D0000-0x0000000000B1F000-memory.dmp
memory/4208-1-0x0000000000B1E000-0x0000000000B1F000-memory.dmp
memory/4208-5-0x00000000009D0000-0x0000000000B1F000-memory.dmp
memory/4208-8-0x00000000009D0000-0x0000000000B1F000-memory.dmp