Resubmissions
10/04/2024, 02:29
240410-cy22baca541010/04/2024, 02:29
240410-cy2esafc8z1010/04/2024, 02:29
240410-cy1s9aca521010/04/2024, 02:29
240410-cy1hgsfc8x1014/10/2023, 01:29
231014-bwm9pshg4t10Analysis
- max time kernel
1097s - max time network
1599s - platform
windows10-1703_x64 - resource
win10-20240404-en - resource tags
- submitted
10/04/2024, 02:29
General
- Target D5f0a5d17c7420fe49da676.exe
- Size 250KB
- Sample240410-cy22baca54
- SHA256 67474d56996cadf242c087aeac455357bd33e79545538eeade15ae259fb3e869
Malware Config
Signatures
- Detect Gurcu Stealer V3 payload 2 IoCs
- Gurcu, WhiteSnake
Gurcu is a malware stealer written in C#.
- Executes dropped EXE 2 IoCs
- Reads WinSCP keys stored on the system 2 TTPs
Tries to access WinSCP stored sessions.
- Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Accesses Microsoft Outlook profiles 1 TTPs 6 IoCs
- Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Runs ping.exe 1 TTPs 1 IoCs
- Suspicious behavior: EnumeratesProcesses 2 IoCs
- Suspicious use of AdjustPrivilegeToken 3 IoCs
- Suspicious use of WriteProcessMemory 10 IoCs
- Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
- outlook_office_path 1 IoCs
- outlook_win_path 1 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\D5f0a5d17c7420fe49da676.exe"C:\Users\Admin\AppData\Local\Temp\D5f0a5d17c7420fe49da676.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "D5f0a5d17c7420fe49da676" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\EsetSecurity\D5f0a5d17c7420fe49da676.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\D5f0a5d17c7420fe49da676.exe" &&START "" "C:\Users\Admin\AppData\Local\EsetSecurity\D5f0a5d17c7420fe49da676.exe"2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\chcp.comchcp 650013⤵
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C:\Windows\system32\PING.EXEping 127.0.0.13⤵
- Runs ping.exe
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C:\Windows\system32\schtasks.exeschtasks /create /tn "D5f0a5d17c7420fe49da676" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\EsetSecurity\D5f0a5d17c7420fe49da676.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
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C:\Users\Admin\AppData\Local\EsetSecurity\D5f0a5d17c7420fe49da676.exe"C:\Users\Admin\AppData\Local\EsetSecurity\D5f0a5d17c7420fe49da676.exe"3⤵
- Executes dropped EXE
- Accesses Microsoft Outlook profiles
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Users\Admin\AppData\Local\EsetSecurity\D5f0a5d17c7420fe49da676.exeC:\Users\Admin\AppData\Local\EsetSecurity\D5f0a5d17c7420fe49da676.exe1⤵
- Executes dropped EXE
- Accesses Microsoft Outlook profiles
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- outlook_office_path
- outlook_win_path
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
port.dat
D5f0a5d17c7420fe49da676.exe
D5f0a5d17c7420fe49da676.exe.log
installUtilLog.txt
memory/3416-16-0x00007FFD2D570000-0x00007FFD2DF5C000-memory.dmp
memory/3416-11-0x00007FFD2D570000-0x00007FFD2DF5C000-memory.dmp
memory/3416-12-0x000002B61BD80000-0x000002B61BD90000-memory.dmp
memory/3416-17-0x000002B61BD80000-0x000002B61BD90000-memory.dmp
memory/4284-0-0x000001F456E30000-0x000001F456E74000-memory.dmp
memory/4284-2-0x000001F4713B0000-0x000001F4713C0000-memory.dmp
memory/4284-1-0x00007FFD2D570000-0x00007FFD2DF5C000-memory.dmp
memory/4284-6-0x00007FFD2D570000-0x00007FFD2DF5C000-memory.dmp
memory/4520-20-0x0000028F63ED0000-0x0000028F63EE0000-memory.dmp
memory/4520-19-0x00007FFD2D570000-0x00007FFD2DF5C000-memory.dmp
memory/4520-25-0x00007FFD2D570000-0x00007FFD2DF5C000-memory.dmp
memory/4520-26-0x0000028F63ED0000-0x0000028F63EE0000-memory.dmp