Analysis
- max time kernel
9s - max time network
154s - platform
windows10-2004_x64 - resource
win10v2004-20230831-en - resource tags
- submitted
13/09/2023, 12:34
General
- Target f21559ac7c67d871d4f05.exe
- Size 327KB
- Sample230913-prw8psed27
- SHA256 dba8f020ac6d09728422932492657fea3f0a95754cd279f5a949b6982bd32129
Malware Config
Extracted
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gurcu
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https://api.telegram.org/bot5968091729:AAHVag_ncx5c5AIYERGTqv9kr7clJT1_HDU/sendMessage?chat_id=-1001962300376
Signatures
- Gurcu, WhiteSnake
Gurcu is a malware stealer written in C#.
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 1 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
- 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 use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of WriteProcessMemory 10 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\f21559ac7c67d871d4f05.exe"C:\Users\Admin\AppData\Local\Temp\f21559ac7c67d871d4f05.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 "f21559ac7c67d871d4f05" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\f21559ac7c67d871d4f05.exe" &&START "" "C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.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 "f21559ac7c67d871d4f05" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
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C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe"C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe"3⤵
- Executes dropped EXE
- Accesses Microsoft Outlook profiles
- Suspicious use of AdjustPrivilegeToken
- outlook_office_path
- outlook_win_path
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
f21559ac7c67d871d4f05.exe.log
f21559ac7c67d871d4f05.exe
f21559ac7c67d871d4f05.exe
memory/2100-11-0x00007FFBEECB0000-0x00007FFBEF771000-memory.dmp
memory/2100-12-0x0000021A737F0000-0x0000021A73800000-memory.dmp
memory/3768-0-0x000002793D8E0000-0x000002793D938000-memory.dmp
memory/3768-1-0x00007FFBEFD20000-0x00007FFBF07E1000-memory.dmp
memory/3768-3-0x0000027958020000-0x0000027958030000-memory.dmp
memory/3768-6-0x00007FFBEFD20000-0x00007FFBF07E1000-memory.dmp