Resubmissions
10/04/2024, 02:56
240410-dff7kacd241010/04/2024, 02:56
240410-de3zyacc961010/04/2024, 02:56
240410-de3deaff6t1010/04/2024, 02:56
240410-de23msff6s1009/09/2023, 14:35
230909-rx47lsbh5210Analysis
- max time kernel
315s - max time network
1600s - platform
windows10-1703_x64 - resource
win10-20240404-en - resource tags
- submitted
10/04/2024, 02:56
General
- Target a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe
- Size 119KB
- Sample240410-dff7kacd24
- SHA256 a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647
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 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 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\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe"C:\Users\Admin\AppData\Local\Temp\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.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 "a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\EsetSecurity\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe" &&START "" "C:\Users\Admin\AppData\Local\EsetSecurity\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.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 "a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\EsetSecurity\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
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C:\Users\Admin\AppData\Local\EsetSecurity\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe"C:\Users\Admin\AppData\Local\EsetSecurity\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.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\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exeC:\Users\Admin\AppData\Local\EsetSecurity\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.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
a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe
a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe.log
installUtilLog.txt
memory/1744-3-0x00007FFC0C720000-0x00007FFC0D10C000-memory.dmp
memory/1744-6-0x00007FFC0C720000-0x00007FFC0D10C000-memory.dmp
memory/1744-0-0x0000016B01520000-0x0000016B01544000-memory.dmp
memory/1744-4-0x0000016B1BD10000-0x0000016B1BD20000-memory.dmp
memory/4524-16-0x00007FFC0C720000-0x00007FFC0D10C000-memory.dmp
memory/4524-12-0x00007FFC0C720000-0x00007FFC0D10C000-memory.dmp
memory/4524-17-0x0000025BA34B0000-0x0000025BA34C0000-memory.dmp
memory/4524-13-0x0000025BA34B0000-0x0000025BA34C0000-memory.dmp
memory/4720-19-0x00007FFC0C720000-0x00007FFC0D10C000-memory.dmp
memory/4720-20-0x000001A62A700000-0x000001A62A710000-memory.dmp
memory/4720-25-0x00007FFC0C720000-0x00007FFC0D10C000-memory.dmp
memory/4720-26-0x000001A62A700000-0x000001A62A710000-memory.dmp