Analysis
- max time kernel
145s - max time network
153s - platform
windows10-2004_x64 - resource
win10v2004-20230831-en - resource tags
- submitted
14/09/2023, 10:44
General
- Target D5f0a5d17c7420fe49da676.exe
- Size 250KB
- Sample230914-mtbzfaeb46
- SHA256 67474d56996cadf242c087aeac455357bd33e79545538eeade15ae259fb3e869
Malware Config
Signatures
- Detect Gurcu Stealer V3 payload 3 IoCs
- Gurcu, WhiteSnake
Gurcu is a malware stealer written in C#.
- Checks computer location settings 2 TTPs 2 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 2 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).
- 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 2 IoCs
- Suspicious use of WriteProcessMemory 14 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\D5f0a5d17c7420fe49da676.exe"C:\Users\Admin\AppData\Local\Temp\D5f0a5d17c7420fe49da676.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 "D5f0a5d17c7420fe49da676" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\EsetSecurity\D5f0a5d17c7420fe49da676.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\D5f0a5d17c7420fe49da676.exe" &&START "" "C:\Users\Admin\AppData\Local\EsetSecurity\D5f0a5d17c7420fe49da676.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 "D5f0a5d17c7420fe49da676" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\EsetSecurity\D5f0a5d17c7420fe49da676.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
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C:\Users\Admin\AppData\Local\EsetSecurity\D5f0a5d17c7420fe49da676.exe"C:\Users\Admin\AppData\Local\EsetSecurity\D5f0a5d17c7420fe49da676.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\tmp74E2.tmp" -C "C:\Users\Admin\AppData\Local\6rfb5r0uff"4⤵
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C:\Users\Admin\AppData\Local\6rfb5r0uff\tor\tor.exe"C:\Users\Admin\AppData\Local\6rfb5r0uff\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\6rfb5r0uff\torrc.txt"4⤵
- Executes dropped EXE
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
cached-microdesc-consensus.tmp
cached-microdescs.new
hostname
tor.exe
tor.exe
torrc.txt
D5f0a5d17c7420fe49da676.exe
D5f0a5d17c7420fe49da676.exe
D5f0a5d17c7420fe49da676.exe.log
tmp74E2.tmp
memory/2928-11-0x00007FF821C10000-0x00007FF8226D1000-memory.dmp
memory/2928-12-0x00000197A91F0000-0x00000197A9200000-memory.dmp
memory/2928-45-0x00007FF821C10000-0x00007FF8226D1000-memory.dmp
memory/2928-50-0x00000197A91F0000-0x00000197A9200000-memory.dmp
memory/4228-0-0x000001F251D50000-0x000001F251D94000-memory.dmp
memory/4228-6-0x00007FF822900000-0x00007FF8233C1000-memory.dmp
memory/4228-2-0x000001F252190000-0x000001F2521A0000-memory.dmp
memory/4228-1-0x00007FF822900000-0x00007FF8233C1000-memory.dmp