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
299s - max time network
305s - platform
windows10-2004_x64 - resource
win10v2004-20240226-en - resource tags
- submitted
10/04/2024, 02:56
General
- Target a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe
- Size 119KB
- Sample240410-de23msff6s
- SHA256 a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647
Malware Config
Signatures
- Detect Gurcu Stealer V3 payload 2 IoCs
- Gurcu, WhiteSnake
Gurcu is a malware stealer written in C#.
- Checks computer location settings 2 TTPs 7 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 12 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 18 IoCs
- Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
- Looks up external IP address via web service 5 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 11 IoCs
- Suspicious use of AdjustPrivilegeToken 7 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
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C:\Users\Admin\AppData\Local\Temp\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe"C:\Users\Admin\AppData\Local\Temp\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe"1⤵
- Checks computer location settings
- 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⤵
- Checks computer location settings
- Executes dropped EXE
- Accesses Microsoft Outlook profiles
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\System32\tar.exe"C:\Windows\System32\tar.exe" -xvzf "C:\Users\Admin\AppData\Local\Temp\tmpBA18.tmp" -C "C:\Users\Admin\AppData\Local\84tnjh4449"4⤵
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C:\Users\Admin\AppData\Local\84tnjh4449\tor\tor.exe"C:\Users\Admin\AppData\Local\84tnjh4449\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\84tnjh4449\torrc.txt"4⤵
- Executes dropped EXE
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C:\Users\Admin\AppData\Local\EsetSecurity\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exeC:\Users\Admin\AppData\Local\EsetSecurity\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe1⤵
- Checks computer location settings
- Executes dropped EXE
- Accesses Microsoft Outlook profiles
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\84tnjh4449\tor\tor.exe"C:\Users\Admin\AppData\Local\84tnjh4449\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\84tnjh4449\torrc.txt"2⤵
- Executes dropped EXE
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C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=4432 --field-trial-handle=3084,i,11997299123381683778,5904351605020331957,262144 --variations-seed-version /prefetch:81⤵
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C:\Users\Admin\AppData\Local\EsetSecurity\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exeC:\Users\Admin\AppData\Local\EsetSecurity\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe1⤵
- Checks computer location settings
- Executes dropped EXE
- Accesses Microsoft Outlook profiles
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\84tnjh4449\tor\tor.exe"C:\Users\Admin\AppData\Local\84tnjh4449\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\84tnjh4449\torrc.txt"2⤵
- Executes dropped EXE
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C:\Users\Admin\AppData\Local\EsetSecurity\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exeC:\Users\Admin\AppData\Local\EsetSecurity\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe1⤵
- Checks computer location settings
- Executes dropped EXE
- Accesses Microsoft Outlook profiles
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\84tnjh4449\tor\tor.exe"C:\Users\Admin\AppData\Local\84tnjh4449\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\84tnjh4449\torrc.txt"2⤵
- Executes dropped EXE
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C:\Users\Admin\AppData\Local\EsetSecurity\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exeC:\Users\Admin\AppData\Local\EsetSecurity\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe1⤵
- Checks computer location settings
- Executes dropped EXE
- Accesses Microsoft Outlook profiles
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\84tnjh4449\tor\tor.exe"C:\Users\Admin\AppData\Local\84tnjh4449\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\84tnjh4449\torrc.txt"2⤵
- Executes dropped EXE
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C:\Users\Admin\AppData\Local\EsetSecurity\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exeC:\Users\Admin\AppData\Local\EsetSecurity\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe1⤵
- Checks computer location settings
- Executes dropped EXE
- Accesses Microsoft Outlook profiles
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- outlook_office_path
- outlook_win_path
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C:\Users\Admin\AppData\Local\84tnjh4449\tor\tor.exe"C:\Users\Admin\AppData\Local\84tnjh4449\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\84tnjh4449\torrc.txt"2⤵
- Executes dropped EXE
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
cached-certs
cached-microdesc-consensus.tmp
cached-microdescs.new
hostname
port.dat
tor.exe
torrc.txt
a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe
a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe.log
installUtilLog.txt
installUtilLog.txt
installUtilLog.txt
installUtilLog.txt
tmpBA18.tmp
memory/1204-43-0x0000021EE2DD0000-0x0000021EE2DE0000-memory.dmp
memory/1204-41-0x00007FF8EF0E0000-0x00007FF8EFBA1000-memory.dmp
memory/1204-60-0x00007FF8EF0E0000-0x00007FF8EFBA1000-memory.dmp
memory/1204-59-0x0000021EE2DE0000-0x0000021EE2EE2000-memory.dmp
memory/1628-119-0x000002B727150000-0x000002B727252000-memory.dmp
memory/1628-115-0x00007FF8EF0E0000-0x00007FF8EFBA1000-memory.dmp
memory/1628-120-0x00007FF8EF0E0000-0x00007FF8EFBA1000-memory.dmp
memory/2832-141-0x00007FF8EF0E0000-0x00007FF8EFBA1000-memory.dmp
memory/2832-140-0x000001A87AAD0000-0x000001A87ABD2000-memory.dmp
memory/2832-136-0x00007FF8EF0E0000-0x00007FF8EFBA1000-memory.dmp
memory/2968-6-0x00007FF8EF690000-0x00007FF8F0151000-memory.dmp
memory/2968-0-0x0000019A60840000-0x0000019A60864000-memory.dmp
memory/2968-3-0x00007FF8EF690000-0x00007FF8F0151000-memory.dmp
memory/2968-4-0x0000019A62460000-0x0000019A62470000-memory.dmp
memory/4000-149-0x00007FF8EF0E0000-0x00007FF8EFBA1000-memory.dmp
memory/4000-158-0x00007FF8EF0E0000-0x00007FF8EFBA1000-memory.dmp
memory/4000-157-0x000001FCD0060000-0x000001FCD0162000-memory.dmp
memory/4636-11-0x00007FF8EF0E0000-0x00007FF8EFBA1000-memory.dmp
memory/4636-54-0x000001E375500000-0x000001E375602000-memory.dmp
memory/4636-70-0x000001E3753B0000-0x000001E3753C0000-memory.dmp
memory/4636-12-0x000001E3753B0000-0x000001E3753C0000-memory.dmp
memory/4636-61-0x00007FF8EF0E0000-0x00007FF8EFBA1000-memory.dmp
memory/4720-98-0x0000021BBB060000-0x0000021BBB070000-memory.dmp
memory/4720-97-0x00007FF8EF0E0000-0x00007FF8EFBA1000-memory.dmp
memory/4720-103-0x00007FF8EF0E0000-0x00007FF8EFBA1000-memory.dmp
memory/4720-102-0x0000021BBB3B0000-0x0000021BBB4B2000-memory.dmp