Resubmissions
10/04/2024, 02:58
240410-dgn9kacd461010/04/2024, 02:58
240410-dgnm2aff7x1010/04/2024, 02:58
240410-dgnb9sff7w1010/04/2024, 02:58
240410-dgm2haff7v1023/08/2023, 14:58
230823-sb7laaed4110Analysis
- max time kernel
644s - max time network
1756s - platform
windows10-1703_x64 - resource
win10-20240404-en - resource tags
- submitted
10/04/2024, 02:58
General
- Target loader.exe
- Size 401KB
- Sample240410-dgn9kacd46
- SHA256 8d647fd3ebb00c9d853eb728ff7cba75b7a089d30f84090e3bc1dc460bdd47f3
Malware Config
Extracted
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gurcu
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https://api.telegram.org/bot6193093056:AAHzyNGUGS9aUG6CCx6ENLoXpCFLzEQywIQ/sendMessage?chat_id=1098292643
Signatures
- 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 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
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C:\Users\Admin\AppData\Local\Temp\loader.exe"C:\Users\Admin\AppData\Local\Temp\loader.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 "loader" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\loader.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\loader.exe" &&START "" "C:\Users\Admin\AppData\Local\TeamViewer\loader.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 "loader" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\loader.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
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C:\Users\Admin\AppData\Local\TeamViewer\loader.exe"C:\Users\Admin\AppData\Local\TeamViewer\loader.exe"3⤵
- Executes dropped EXE
- Accesses Microsoft Outlook profiles
- Suspicious use of AdjustPrivilegeToken
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C:\Users\Admin\AppData\Local\TeamViewer\loader.exeC:\Users\Admin\AppData\Local\TeamViewer\loader.exe1⤵
- Executes dropped EXE
- Accesses Microsoft Outlook profiles
- Suspicious use of AdjustPrivilegeToken
- outlook_office_path
- outlook_win_path
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
loader.exe.log
loader.exe
port.dat
memory/216-17-0x000001F278AF0000-0x000001F278B00000-memory.dmp
memory/216-11-0x00007FFA56E20000-0x00007FFA5780C000-memory.dmp
memory/216-12-0x000001F278AF0000-0x000001F278B00000-memory.dmp
memory/216-15-0x00007FFA56E20000-0x00007FFA5780C000-memory.dmp
memory/3684-19-0x0000021076600000-0x0000021076610000-memory.dmp
memory/3684-18-0x00007FFA56E20000-0x00007FFA5780C000-memory.dmp
memory/3684-22-0x00007FFA56E20000-0x00007FFA5780C000-memory.dmp
memory/3684-23-0x0000021076600000-0x0000021076610000-memory.dmp
memory/4684-6-0x00007FFA56E20000-0x00007FFA5780C000-memory.dmp
memory/4684-2-0x0000021B62120000-0x0000021B62130000-memory.dmp
memory/4684-0-0x0000021B47BE0000-0x0000021B47C48000-memory.dmp
memory/4684-1-0x00007FFA56E20000-0x00007FFA5780C000-memory.dmp