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
1563s - max time network
1565s - platform
windows7_x64 - resource
win7-20240221-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 5 IoCs
- Gurcu, WhiteSnake
Gurcu is a malware stealer written in C#.
- Deletes itself 1 IoCs
- 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.
- Modifies system certificate store 2 TTPs 6 IoCs
- Runs ping.exe 1 TTPs 1 IoCs
- Suspicious behavior: EnumeratesProcesses 2 IoCs
- Suspicious use of AdjustPrivilegeToken 3 IoCs
- Suspicious use of WriteProcessMemory 24 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
-
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⤵
- Deletes itself
- Suspicious use of WriteProcessMemory
-
C:\Windows\system32\chcp.comchcp 650013⤵
-
-
C:\Windows\system32\PING.EXEping 127.0.0.13⤵
- Runs ping.exe
-
-
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)
-
-
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
- Modifies system certificate store
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\system32\WerFault.exeC:\Windows\system32\WerFault.exe -u -p 2644 -s 30404⤵
-
-
-
-
C:\Windows\system32\taskeng.exetaskeng.exe {86AD4B84-A4EF-453C-A381-D362649B62D5} S-1-5-21-2297530677-1229052932-2803917579-1000:HKULBIBU\Admin:Interactive:[1]1⤵
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Local\EsetSecurity\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exeC:\Users\Admin\AppData\Local\EsetSecurity\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe2⤵
- Executes dropped EXE
- Accesses Microsoft Outlook profiles
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- outlook_office_path
- outlook_win_path
-
C:\Windows\system32\WerFault.exeC:\Windows\system32\WerFault.exe -u -p 816 -s 31123⤵
-
-
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
94308059B57B3142E455B38A6EB92015
94308059B57B3142E455B38A6EB92015
94308059B57B3142E455B38A6EB92015
port.dat
a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe
Cab2733.tmp
Tar2833.tmp
installUtilLog.txt
memory/816-107-0x000007FEF5070000-0x000007FEF5A5C000-memory.dmp
memory/816-85-0x000007FEF5070000-0x000007FEF5A5C000-memory.dmp
memory/2644-9-0x0000000000C10000-0x0000000000C34000-memory.dmp
memory/2644-81-0x000007FEF5070000-0x000007FEF5A5C000-memory.dmp
memory/2644-82-0x000000001B180000-0x000000001B200000-memory.dmp
memory/2644-11-0x000000001B180000-0x000000001B200000-memory.dmp
memory/2644-10-0x000007FEF5070000-0x000007FEF5A5C000-memory.dmp
memory/2940-5-0x000007FEF5A60000-0x000007FEF644C000-memory.dmp
memory/2940-2-0x000000001B470000-0x000000001B4F0000-memory.dmp
memory/2940-1-0x000007FEF5A60000-0x000007FEF644C000-memory.dmp
memory/2940-0-0x0000000000860000-0x0000000000884000-memory.dmp