Analysis
- max time kernel
150s - max time network
151s - platform
windows10-2004_x64 - resource
win10v2004-20240226-en - resource tags
- submitted
20/03/2024, 23:26
General
- Target e6fe558f6c026493bff28c7451069715.exe
- Size 307KB
- Sample240320-3ettpsfa21
- SHA256 75e985ad843283de707a360843a5ac65e0800b8dde13004c9eec247bc4ee4437
Malware Config
Signatures
- Buer
Buer is a new modular loader first seen in August 2019.
- Stealc
Stealc is an infostealer written in C++.
- Downloads MZ/PE file
- Checks computer location settings 2 TTPs 2 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 1 IoCs
- Loads dropped DLL 2 IoCs
- Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
- Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
- Adds Run key to start application 2 TTPs 1 IoCs
- Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Program crash 1 IoCs
- Checks processor information in registry 2 TTPs 2 IoCs
Processor information is often read in order to detect sandboxing environments.
- Runs ping.exe 1 TTPs 1 IoCs
- Suspicious behavior: EnumeratesProcesses 64 IoCs
- Suspicious use of AdjustPrivilegeToken 1 IoCs
- Suspicious use of WriteProcessMemory 12 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\e6fe558f6c026493bff28c7451069715.exe"C:\Users\Admin\AppData\Local\Temp\e6fe558f6c026493bff28c7451069715.exe"1⤵
- Checks computer location settings
- Loads dropped DLL
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\system32\cmd.exe" /c start "" "C:\Users\Admin\AppData\Local\Temp\FBFHDBKJEG.exe"2⤵
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\FBFHDBKJEG.exe"C:\Users\Admin\AppData\Local\Temp\FBFHDBKJEG.exe"3⤵
- Checks computer location settings
- Executes dropped EXE
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /C ping 2.2.2.2 -n 1 -w 3000 > Nul & Del C:\Users\Admin\AppData\Local\Temp\FBFHDBKJEG.exe4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\PING.EXEping 2.2.2.2 -n 1 -w 30005⤵
- Runs ping.exe
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 5028 -s 24042⤵
- Program crash
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 5028 -ip 50281⤵
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
Are.docx
mozglue.dll
nss3.dll
FBFHDBKJEG.exe
memory/3856-89-0x0000000072230000-0x00000000729E0000-memory.dmp
memory/3856-88-0x0000000000270000-0x000000000028E000-memory.dmp
memory/3856-90-0x0000000004AD0000-0x0000000004AE0000-memory.dmp
memory/3856-93-0x0000000072230000-0x00000000729E0000-memory.dmp
memory/3856-94-0x0000000004AD0000-0x0000000004AE0000-memory.dmp
memory/5028-53-0x0000000000400000-0x0000000002D4B000-memory.dmp
memory/5028-43-0x0000000000400000-0x0000000002D4B000-memory.dmp
memory/5028-4-0x0000000061E00000-0x0000000061EF3000-memory.dmp
memory/5028-3-0x0000000000400000-0x0000000002D4B000-memory.dmp
memory/5028-81-0x0000000003060000-0x0000000003160000-memory.dmp
memory/5028-2-0x0000000002FF0000-0x0000000003017000-memory.dmp
memory/5028-1-0x0000000003060000-0x0000000003160000-memory.dmp
memory/5028-92-0x0000000000400000-0x0000000002D4B000-memory.dmp