Analysis
- max time kernel
451s - max time network
455s - platform
windows10-2004_x64 - resource
win10v2004-20220812-en - resource tags
- submitted
18/10/2022, 01:50
General
- Target Setup.exe
- Size 304.4MB
- Sample221018-b9bstsecck
- SHA256 e58df6719823d607f8df583b55f35c5413241d902459e7f3375108b4bbd88ca1
Malware Config
Extracted
-
cryptbot
-
[<
Signatures
- CryptBot
A C++ stealer distributed widely in bundle with other software.
- Executes dropped EXE 1 IoCs
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- 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
- Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
- Maps connected drives based on registry 3 TTPs 2 IoCs
Disk information is often read in order to detect sandboxing environments.
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
- Checks processor information in registry 2 TTPs 3 IoCs
Processor information is often read in order to detect sandboxing environments.
- Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Delays execution with timeout.exe 1 IoCs
- Suspicious behavior: EnumeratesProcesses 64 IoCs
- Suspicious use of WriteProcessMemory 12 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\Setup.exe"C:\Users\Admin\AppData\Local\Temp\Setup.exe"1⤵
- Checks computer location settings
- Maps connected drives based on registry
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\cmd.exe/C schtasks /create /tn \Diagnostic\Service /tr """"C:\Users\Admin\AppData\Roaming\lqfqu\corsve.exe""" """C:\Users\Admin\AppData\Roaming\lqfqu\corsve.dat"""" /du 9700:18 /st 00:02 /sc once /ri 1 /f2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\schtasks.exeschtasks /create /tn \Diagnostic\Service /tr """"C:\Users\Admin\AppData\Roaming\lqfqu\corsve.exe""" """C:\Users\Admin\AppData\Roaming\lqfqu\corsve.dat"""" /du 9700:18 /st 00:02 /sc once /ri 1 /f3⤵
- Creates scheduled task(s)
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c timeout -t 5 && del "C:\Users\Admin\AppData\Local\Temp\Setup.exe"2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\timeout.exetimeout -t 53⤵
- Delays execution with timeout.exe
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C:\Users\Admin\AppData\Roaming\lqfqu\corsve.exeC:\Users\Admin\AppData\Roaming\lqfqu\corsve.exe "C:\Users\Admin\AppData\Roaming\lqfqu\corsve.dat"1⤵
- Executes dropped EXE
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
corsve.dat
corsve.exe
memory/4780-133-0x00000000137A0000-0x000000001385F000-memory.dmp
memory/4780-136-0x00000000137A0000-0x000000001385F000-memory.dmp