Resubmissions
10/04/2024, 02:28
240410-cyaxtsca431010/04/2024, 02:28
240410-cx45aaca361010/04/2024, 02:28
240410-cx4hrafc611010/04/2024, 02:28
240410-cx37zsfc6y1014/10/2023, 01:16
231014-bm3ysshd6t10Analysis
- max time kernel
616s - max time network
887s - platform
windows10-1703_x64 - resource
win10-20240404-en - resource tags
- submitted
10/04/2024, 02:28
General
- Target m1f1f3a069223072f8d6802a079235d.exe
- Size 306KB
- Sample240410-cx45aaca36
- SHA256 c2e57e9b6e52a5429ae7a7bd36c57f63589d78fbf0ffe5760ada4a67b9fadec9
Malware Config
Extracted
-
gurcu
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https://api.telegram.org/bot6209822134:AAHQxD-CI1YDVcNbXijXHlonsEUgv3dfYtg/sendMessage?chat_id=-1001529292045
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 2 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\m1f1f3a069223072f8d6802a079235d.exe"C:\Users\Admin\AppData\Local\Temp\m1f1f3a069223072f8d6802a079235d.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 "m1f1f3a069223072f8d6802a079235d" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\m1f1f3a069223072f8d6802a079235d.exe" &&START "" "C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.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 "m1f1f3a069223072f8d6802a079235d" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
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C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe"C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe"3⤵
- Executes dropped EXE
- Accesses Microsoft Outlook profiles
- Suspicious use of AdjustPrivilegeToken
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C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exeC:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.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
m1f1f3a069223072f8d6802a079235d.exe.log
m1f1f3a069223072f8d6802a079235d.exe
port.dat
memory/2220-19-0x0000023464D30000-0x0000023464D40000-memory.dmp
memory/2220-23-0x0000023464D30000-0x0000023464D40000-memory.dmp
memory/2220-22-0x00007FFF034F0000-0x00007FFF03EDC000-memory.dmp
memory/2220-18-0x00007FFF034F0000-0x00007FFF03EDC000-memory.dmp
memory/2520-1-0x00007FFF034F0000-0x00007FFF03EDC000-memory.dmp
memory/2520-4-0x000001DEEF950000-0x000001DEEF960000-memory.dmp
memory/2520-6-0x00007FFF034F0000-0x00007FFF03EDC000-memory.dmp
memory/2520-0-0x000001DED5420000-0x000001DED5472000-memory.dmp
memory/4588-11-0x00007FFF034F0000-0x00007FFF03EDC000-memory.dmp
memory/4588-16-0x00000236B1F10000-0x00000236B1F20000-memory.dmp
memory/4588-15-0x00007FFF034F0000-0x00007FFF03EDC000-memory.dmp
memory/4588-12-0x00000236B1F10000-0x00000236B1F20000-memory.dmp